chore(release): 4.3.0 [skip ci]

Also add `mathematics_max_values` and
`mathematics_min_values` to check in array.

.clang-format

@@ -1,2 +1,2 @@
-BasedOnStyle: 'Google'
+BasedOnStyle: "Google"
 ColumnLimit: 0

.github/ISSUE_TEMPLATE/BUG.md

@@ -1,8 +1,8 @@
 ---
-name: '🐛 Bug Report'
-about: 'Report an unexpected problem or unintended behavior.'
-title: '[Bug]'
-labels: 'bug'
+name: "🐛 Bug Report"
+about: "Report an unexpected problem or unintended behavior."
+title: "[Bug]"
+labels: "bug"
 ---
 
 <!--

.github/ISSUE_TEMPLATE/DOCUMENTATION.md

@@ -1,8 +1,8 @@
 ---
-name: '📜 Documentation'
-about: 'Correct spelling errors, improvements or additions to documentation files (README, CONTRIBUTING...).'
-title: '[Documentation]'
-labels: 'documentation'
+name: "📜 Documentation"
+about: "Correct spelling errors, improvements or additions to documentation files (README, CONTRIBUTING...)."
+title: "[Documentation]"
+labels: "documentation"
 ---
 
 <!-- Please make sure your issue has not already been fixed. -->

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

@@ -1,8 +1,8 @@
 ---
-name: '✨ Feature Request'
-about: 'Suggest a new feature idea.'
-title: '[Feature]'
-labels: 'feature request'
+name: "✨ Feature Request"
+about: "Suggest a new feature idea."
+title: "[Feature]"
+labels: "feature request"
 ---
 
 <!-- Please make sure your issue has not already been fixed. -->

.github/ISSUE_TEMPLATE/IMPROVEMENT.md

@@ -1,8 +1,8 @@
 ---
-name: '🔧 Improvement'
-about: 'Improve structure/format/performance/refactor/tests of the code.'
-title: '[Improvement]'
-labels: 'improvement'
+name: "🔧 Improvement"
+about: "Improve structure/format/performance/refactor/tests of the code."
+title: "[Improvement]"
+labels: "improvement"
 ---
 
 <!-- Please make sure your issue has not already been fixed. -->

.github/ISSUE_TEMPLATE/QUESTION.md

@@ -1,8 +1,8 @@
 ---
-name: '🙋 Question'
-about: 'Further information is requested.'
-title: '[Question]'
-labels: 'question'
+name: "🙋 Question"
+about: "Further information is requested."
+title: "[Question]"
+labels: "question"
 ---
 
 ### Question

.github/workflows/ci.yml

@@ -1,40 +1,40 @@
-name: 'CI'
+name: "CI"
 
 on:
   push:
     branches: [develop]
   pull_request:
-    branches: [master, develop]
+    branches: [main, develop]
 
 jobs:
   ci:
-    runs-on: 'ubuntu-latest'
+    runs-on: "ubuntu-latest"
     steps:
-      - uses: 'actions/checkout@v3.5.3'
+      - uses: "actions/checkout@v4.1.7"
 
-      - run: 'sudo apt update'
+      - run: "sudo apt update"
 
-      - name: 'Install Build Tools'
-        run: 'sudo apt-get install --yes build-essential gcc make clang-format'
+      - name: "Install Build Tools"
+        run: "sudo apt install --yes build-essential gcc make clang-format"
 
-      - name: 'Install Documentation Tools'
-        run: 'sudo apt-get install --yes doxygen doxygen-gui doxygen-doc graphviz'
+      - name: "Install Documentation Tools"
+        run: "sudo apt install --yes doxygen doxygen-gui doxygen-doc graphviz"
 
-      - run: 'gcc --version'
+      - run: "gcc --version"
 
-      - run: 'make'
-      - run: 'make run'
-      - run: 'make test'
-      - run: 'make lint'
-      - run: 'make documentation'
-      - run: 'make set_version'
-      - run: 'make clean'
+      - run: "make"
+      - run: "make run"
+      - run: "make test"
+      - run: "make lint"
+      - run: "make documentation"
+      - run: "make set_version"
+      - run: "make clean"
 
   lint-commit:
-      runs-on: 'ubuntu-latest'
-      steps:
-        - uses: 'actions/checkout@v3.5.3'
-          with:
-            fetch-depth: 0
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: "actions/checkout@v4.1.7"
+        with:
+          fetch-depth: 0
 
-        - uses: 'wagoid/commitlint-github-action@v5.4.1'
+      - uses: "wagoid/commitlint-github-action@v6.1.2"

.github/workflows/release.yml

@@ -1,57 +1,57 @@
-name: 'Release'
+name: "Release"
 
 on:
   push:
-    branches: [master]
+    branches: [main]
 
 jobs:
   release:
-    runs-on: 'ubuntu-latest'
+    runs-on: "ubuntu-latest"
     steps:
-      - uses: 'actions/checkout@v3.5.3'
+      - uses: "actions/checkout@v4.1.7"
         with:
           fetch-depth: 0
           persist-credentials: false
-          submodules: recursive
+          submodules: "recursive"
 
-      - name: 'Import GPG key'
-        uses: 'crazy-max/ghaction-import-gpg@v5.3.0'
+      - name: "Import GPG key"
+        uses: "crazy-max/ghaction-import-gpg@v6.1.0"
         with:
           gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
           git_user_signingkey: true
           git_commit_gpgsign: true
 
-      - run: 'sudo apt update'
+      - run: "sudo apt update"
 
-      - name: 'Install Build Tools'
-        run: 'sudo apt-get install --yes build-essential gcc make clang-format'
+      - name: "Install Build Tools"
+        run: "sudo apt install --yes build-essential gcc make clang-format"
 
-      - name: 'Install Documentation Tools'
-        run: 'sudo apt-get install --yes doxygen doxygen-gui doxygen-doc graphviz'
+      - name: "Install Documentation Tools"
+        run: "sudo apt install --yes doxygen doxygen-gui doxygen-doc graphviz"
 
-      - run: 'make set_version'
+      - run: "make set_version"
 
-      - name: 'Use Node.js'
-        uses: 'actions/setup-node@v3.7.0'
+      - name: "Use Node.js"
+        uses: "actions/setup-node@v4.0.3"
         with:
-          node-version: '18.17.0'
+          node-version: "20.17.0"
 
-      - name: 'Install Release Tools'
-        run: 'npm install --save-dev semantic-release@21.0.7 @commitlint/cli@17.6.7 @commitlint/config-conventional@17.6.7 @semantic-release/git@10.0.1 @semantic-release/exec@6.0.3 @saithodev/semantic-release-backmerge@3.2.0 vercel@31.2.2'
+      - name: "Install Release Tools"
+        run: "npm install --save-dev semantic-release@23.1.1 @commitlint/cli@19.5.0 @commitlint/config-conventional@19.5.0 @semantic-release/git@10.0.1 @semantic-release/exec@6.0.3 @saithodev/semantic-release-backmerge@4.0.1 vercel@37.4.2"
 
-      - run: 'rm --force package.json package-lock.json'
+      - run: "rm --force package.json package-lock.json"
 
-      - name: 'Release'
-        run: 'npx semantic-release'
+      - name: "Release"
+        run: "npx semantic-release"
         env:
           GH_TOKEN: ${{ secrets.GH_TOKEN }}
           GIT_COMMITTER_NAME: ${{ secrets.GIT_NAME }}
           GIT_COMMITTER_EMAIL: ${{ secrets.GIT_EMAIL }}
 
-      - name: 'Generate Documentation'
-        run: 'make documentation'
+      - name: "Generate Documentation"
+        run: "make documentation"
 
-      - name: 'Deploy to Vercel'
+      - name: "Deploy to Vercel"
         run: 'npx vercel ./documentation/html --token="${VERCEL_TOKEN}" --prod'
         env:
           VERCEL_TOKEN: ${{ secrets.VERCEL_TOKEN }}

.releaserc.json

@@ -1,5 +1,5 @@
 {
-  "branches": ["master"],
+  "branches": ["main"],
   "plugins": [
     [
       "@semantic-release/commit-analyzer",
@@ -30,7 +30,7 @@
     [
       "@saithodev/semantic-release-backmerge",
       {
-        "branches": [{ "from": "master", "to": "develop" }],
+        "branches": [{ "from": "main", "to": "develop" }],
         "backmergeStrategy": "merge"
       }
     ]

CONTRIBUTING.md

@@ -30,3 +30,18 @@ If you're adding new features to **libcproject**, please include tests.
 ## Commits
 
 The commit message guidelines adheres to [Conventional Commits](https://www.conventionalcommits.org/) and [Semantic Versioning](https://semver.org/) for releases.
+
+## Git Submodules
+
+To get the submodule:
+
+```sh
+git submodule update --init --recursive
+```
+
+To update the version:
+
+```sh
+cd doxygen-awesome-css
+git checkout v2.3.3
+```

Doxyfile

@@ -12,7 +12,7 @@ FILE_PATTERNS = *.h \
   CODE_OF_CONDUCT.md \
   CONTRIBUTING.md \
   LICENSE
-HTML_EXTRA_STYLESHEET  = doxygen-awesome-css/doxygen-awesome.css
+HTML_EXTRA_STYLESHEET = doxygen-awesome-css/doxygen-awesome.css
 
 RECURSIVE = YES
 EXCLUDE = test doxygen-awesome-css node_modules

LICENSE

@@ -1,6 +1,6 @@
-MIT License
+# MIT License
 
-Copyright (c) Théo LUDWIG
+Copyright (c) Théo LUDWIG <contact@theoludwig.fr>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -5,11 +5,11 @@
 </p>
 
 <p align="center">
-  <a href="./CONTRIBUTING.md"><img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat" /></a>
+  <a href="./CONTRIBUTING.md"><img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat" alt="Contributing" /></a>
   <a href="./LICENSE"><img src="https://img.shields.io/badge/licence-MIT-blue.svg" alt="Licence MIT"/></a>
   <a href="./CODE_OF_CONDUCT.md"><img src="https://img.shields.io/badge/Contributor%20Covenant-v2.0%20adopted-ff69b4.svg" alt="Contributor Covenant" /></a>
   <br />
-  <a href="https://github.com/theoludwig/libcproject/actions/workflows/ci.yml"><img src="https://github.com/theoludwig/libcproject/actions/workflows/ci.yml/badge.svg?branch=develop" /></a>
+  <a href="https://github.com/theoludwig/libcproject/actions/workflows/ci.yml"><img src="https://github.com/theoludwig/libcproject/actions/workflows/ci.yml/badge.svg?branch=develop" alt="CI" /></a>
   <a href="https://conventionalcommits.org"><img src="https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg" alt="Conventional Commits" /></a>
   <a href="https://github.com/semantic-release/semantic-release"><img src="https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg" alt="semantic-release" /></a>
 </p>
@@ -37,10 +37,10 @@ For example on GNU/Linux Ubuntu:
 
 ```sh
 # Install Build Tools
-sudo apt-get install build-essential gcc make clang-format
+sudo apt install build-essential gcc make clang-format
 
 # Install Documentation Tools
-sudo apt-get install doxygen doxygen-gui doxygen-doc graphviz
+sudo apt install doxygen doxygen-gui doxygen-doc graphviz
 ```
 
 ## Usage

lib/array_list.c

@@ -25,8 +25,8 @@ void array_list_remove(struct array_list* list, size_t index) {
   if (index >= list->size) {
     return;
   }
-  for (size_t i = index + 1; i < list->size - 1; i++) {
-    list->data[i - 1] = list->data[i];
+  for (size_t i = index; i < list->size - 1; i++) {
+    list->data[i] = list->data[i + 1];
   }
   list->size--;
 }

lib/array_list.h

@@ -27,24 +27,36 @@ struct array_list* array_list_initialization();
 
 /**
  * @brief Adds an element to the end of the array list.
+ *
+ * @param list
+ * @param element
  * @since v1.2.0
  */
 void array_list_add(struct array_list* list, void* element);
 
 /**
  * @brief Removes an element from the array list.
+ *
+ * @param list
+ * @param index
  * @since v1.2.0
  */
 void array_list_remove(struct array_list* list, size_t index);
 
 /**
  * @brief Gets an element from the array list.
+ *
+ * @param list
+ * @param index
+ * @return void*
  * @since v1.2.0
  */
 void* array_list_get(struct array_list* list, size_t index);
 
 /**
  * @brief Frees the array list.
+ *
+ * @param list
  * @since v3.0.0
  */
 void array_list_free(struct array_list* list);

lib/character.h

@@ -12,7 +12,7 @@
  * @brief Append a character to a string, assuming string points to an array
  * with enough space.
  *
- * @p
+ * @param string
  * @param character
  * @since v1.0.0
  */
@@ -47,7 +47,9 @@ char character_to_lower(const char character);
 /**
  * @brief Check if the character is a digit ('0', '1', '2', '3', '4', '5', '6', '7, '8' or '9').
  *
- * @return true if the character is a digit, false otherwise
+ * @param character
+ * @return true
+ * @return false
  * @since v1.0.0
  */
 bool character_get_is_digit(const char character);
@@ -57,6 +59,7 @@ bool character_get_is_digit(const char character);
  * Return 0 if the character is not a letter.
  *
  * @param character
+ * @return unsigned char
  * @since v1.0.0
  */
 unsigned char character_get_alphabet_position(const char character);

lib/convert.c

@@ -62,7 +62,7 @@ string_t convert_number_to_string(const long long integer) {
   return string;
 }
 
-string_t convert_number_from_base_10_to_base(unsigned long long number, unsigned int base) {
+string_t convert_number_from_base_10_to_base(unsigned long long number, unsigned long base) {
   if (number == 0) {
     return "0";
   }
@@ -88,10 +88,10 @@ string_t convert_number_from_base_10_to_base(unsigned long long number, unsigned
   return result;
 }
 
-int convert_number_from_base_to_base_10(string_t number, unsigned int base) {
-  int length = string_get_length(number);
+unsigned long convert_number_from_base_to_base_10(string_t number, unsigned long base) {
+  size_t length = string_get_length(number);
   int exponent = length - 1;
-  int result = 0;
+  unsigned long result = 0;
   int index = 0;
   while (exponent >= 0) {
     int current_number = (int)(number[index] - '0');
@@ -107,6 +107,6 @@ int convert_number_from_base_to_base_10(string_t number, unsigned int base) {
   return result;
 }
 
-string_t convert_number_from_base_to_another(string_t number, int base_from, int base_target) {
+string_t convert_number_from_base_to_another(string_t number, unsigned long base_from, unsigned long base_target) {
   return convert_number_from_base_10_to_base(convert_number_from_base_to_base_10(number, base_from), base_target);
 }

lib/convert.h

@@ -15,6 +15,7 @@
  * @brief Convert a character to a string.
  *
  * @param character
+ * @return string_t
  * @since v1.0.0
  */
 string_t convert_character_to_string(const char character);
@@ -23,6 +24,7 @@ string_t convert_character_to_string(const char character);
  * @brief Convert a character to a digit.
  *
  * @param character
+ * @return char
  * @since v1.0.0
  */
 char convert_character_to_digit(const char character);
@@ -31,6 +33,7 @@ char convert_character_to_digit(const char character);
  * @brief Convert a digit to a character.
  *
  * @param digit
+ * @return char
  * @since v1.0.0
  */
 char convert_digit_to_character(const char digit);
@@ -39,6 +42,7 @@ char convert_digit_to_character(const char digit);
  * @brief Convert a string to a number.
  *
  * @param string
+ * @return long long
  * @since v1.0.0
  */
 long long convert_string_to_number(const string_t string);
@@ -47,6 +51,7 @@ long long convert_string_to_number(const string_t string);
  * @brief Convert a number to a string.
  *
  * @param integer
+ * @return string_t
  * @since v1.0.0
  */
 string_t convert_number_to_string(const long long integer);
@@ -56,18 +61,20 @@ string_t convert_number_to_string(const long long integer);
  *
  * @param number
  * @param base
+ * @return string_t
  * @since v1.0.0
  */
-string_t convert_number_from_base_10_to_base(unsigned long long number, unsigned int base);
+string_t convert_number_from_base_10_to_base(unsigned long long number, unsigned long base);
 
 /**
  * @brief Convert a number with a specific base to a number base 10.
  *
  * @param number
  * @param base
+ * @return int
  * @since v1.0.0
  */
-int convert_number_from_base_to_base_10(string_t number, unsigned int base);
+unsigned long convert_number_from_base_to_base_10(string_t number, unsigned long base);
 
 /**
  * @brief Convert a number with a specific base to a number of specific base.
@@ -75,8 +82,9 @@ int convert_number_from_base_to_base_10(string_t number, unsigned int base);
  * @param number
  * @param base_from
  * @param base_target
+ * @return string_t
  * @since v1.0.0
  */
-string_t convert_number_from_base_to_another(string_t number, int base_from, int base_target);
+string_t convert_number_from_base_to_another(string_t number, unsigned long base_from, unsigned long base_target);
 
 #endif

lib/date.c

@@ -0,0 +1,287 @@
+#include "date.h"
+
+struct date *date_copy(struct date *date_to_copy) {
+  struct date *date = malloc(sizeof(struct date));
+  if (date == NULL) {
+    perror("Error (date_copy)");
+    exit(EXIT_FAILURE);
+  }
+  date->year = date_to_copy->year;
+  date->month = date_to_copy->month;
+  date->day = date_to_copy->day;
+  date->hours = date_to_copy->hours;
+  date->minutes = date_to_copy->minutes;
+  date->seconds = date_to_copy->seconds;
+  date->milliseconds = date_to_copy->milliseconds;
+  date->timezone_utc_offset = date_to_copy->timezone_utc_offset;
+  return date;
+}
+
+bool date_get_is_valid_year(uint16_t year) {
+  return year <= 9999;
+}
+
+bool date_get_is_valid_month(uint8_t month) {
+  return month >= 1 && month <= 12;
+}
+
+bool date_get_is_valid_day(uint8_t day) {
+  return day >= 1 && day <= 31;
+}
+
+bool date_get_is_valid_hours(uint8_t hours) {
+  return hours <= 23;
+}
+
+bool date_get_is_valid_minutes(uint8_t minutes) {
+  return minutes <= 59;
+}
+
+bool date_get_is_valid_seconds(uint8_t seconds) {
+  return seconds <= 59;
+}
+
+bool date_get_is_valid_milliseconds(uint16_t milliseconds) {
+  return milliseconds <= 999;
+}
+
+bool date_get_is_valid_timezone_utc_offset(int8_t timezone_utc_offset) {
+  return timezone_utc_offset >= -12 && timezone_utc_offset <= 14;
+}
+
+bool date_get_is_valid(struct date *date) {
+  size_t date_days_of_month = date_get_days_of_month(date->month, date->year);
+  return (date_get_is_valid_month(date->month) &&
+          date_get_is_valid_day(date->day) &&
+          date->day <= date_days_of_month &&
+          date_get_is_valid_hours(date->hours) &&
+          date_get_is_valid_minutes(date->minutes) &&
+          date_get_is_valid_seconds(date->seconds) &&
+          date_get_is_valid_milliseconds(date->milliseconds) &&
+          date_get_is_valid_timezone_utc_offset(date->timezone_utc_offset));
+}
+
+string_t date_to_iso_string(struct date *date_original) {
+  struct date *date = date_copy(date_original);
+  date_to_utc(date);
+
+  size_t iso_string_length = 24;
+  string_t result = malloc(sizeof(char) * (iso_string_length + 1));
+
+  string_t year_string = string_zero_pad(date->year, 4);
+  string_t month_string = string_zero_pad(date->month, 2);
+  string_t day_string = string_zero_pad(date->day, 2);
+  string_t hours_string = string_zero_pad(date->hours, 2);
+  string_t minutes_string = string_zero_pad(date->minutes, 2);
+  string_t seconds_string = string_zero_pad(date->seconds, 2);
+  string_t milliseconds_string = string_zero_pad(date->milliseconds, 3);
+  sprintf(result, "%s-%s-%sT%s:%s:%s.%sZ", year_string, month_string, day_string, hours_string, minutes_string, seconds_string, milliseconds_string);
+  free(year_string);
+  free(month_string);
+  free(day_string);
+  free(hours_string);
+  free(minutes_string);
+  free(seconds_string);
+  free(milliseconds_string);
+
+  free(date);
+  return result;
+}
+
+string_t date_to_iso_string_without_time(struct date *date) {
+  size_t iso_string_length = 10;
+  string_t result = malloc(sizeof(char) * (iso_string_length + 1));
+  if (result == NULL) {
+    perror("Error (date_to_iso_string_without_time)");
+    exit(EXIT_FAILURE);
+  }
+
+  string_t year_string = string_zero_pad(date->year, 4);
+  string_t month_string = string_zero_pad(date->month, 2);
+  string_t day_string = string_zero_pad(date->day, 2);
+  sprintf(result, "%s-%s-%s", year_string, month_string, day_string);
+  free(year_string);
+  free(month_string);
+  free(day_string);
+
+  return result;
+}
+
+struct date *date_from_iso_string(string_t iso_string) {
+  struct date *date = malloc(sizeof(struct date));
+  if (date == NULL) {
+    perror("Error (date_from_iso_string)");
+    exit(EXIT_FAILURE);
+  }
+
+  string_t year_string = string_substring(iso_string, 0, 3);
+  date->year = (uint16_t)convert_string_to_number(year_string);
+  free(year_string);
+
+  string_t month_string = string_substring(iso_string, 5, 6);
+  date->month = (uint8_t)convert_string_to_number(month_string);
+  free(month_string);
+
+  string_t day_string = string_substring(iso_string, 8, 9);
+  date->day = (uint8_t)convert_string_to_number(day_string);
+  free(day_string);
+
+  string_t hours_string = string_substring(iso_string, 11, 12);
+  date->hours = (uint8_t)convert_string_to_number(hours_string);
+  free(hours_string);
+
+  string_t minutes_string = string_substring(iso_string, 14, 15);
+  date->minutes = (uint8_t)convert_string_to_number(minutes_string);
+  free(minutes_string);
+
+  string_t seconds_string = string_substring(iso_string, 17, 18);
+  date->seconds = (uint8_t)convert_string_to_number(seconds_string);
+  free(seconds_string);
+
+  string_t milliseconds_string = string_substring(iso_string, 20, 22);
+  date->milliseconds = (uint16_t)convert_string_to_number(milliseconds_string);
+  free(milliseconds_string);
+
+  date->timezone_utc_offset = 0;
+
+  return date;
+}
+
+uint8_t date_get_days_of_month(uint8_t month, uint16_t year) {
+  switch (month) {
+    case 1:
+      return 31;
+    case 2:
+      return date_get_is_leap_year(year) ? 29 : 28;
+    case 3:
+      return 31;
+    case 4:
+      return 30;
+    case 5:
+      return 31;
+    case 6:
+      return 30;
+    case 7:
+      return 31;
+    case 8:
+      return 31;
+    case 9:
+      return 30;
+    case 10:
+      return 31;
+    case 11:
+      return 30;
+    case 12:
+      return 31;
+    default:
+      return 0;
+  }
+}
+
+bool date_get_is_leap_year(uint16_t year) {
+  return (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
+}
+
+uint64_t date_convert_milliseconds_to_seconds(uint16_t milliseconds) {
+  return milliseconds / MILLISECONDS_PER_SECOND;
+}
+
+uint64_t date_convert_seconds_to_milliseconds(uint64_t seconds) {
+  return seconds * MILLISECONDS_PER_SECOND;
+}
+
+uint64_t date_convert_days_to_seconds(uint64_t days) {
+  return days * SECONDS_PER_DAY;
+}
+
+uint64_t date_convert_hms_to_seconds(uint8_t hours, uint8_t minutes, uint8_t seconds) {
+  return (hours * SECONDS_PER_HOUR) + (minutes * SECONDS_PER_MINUTE) + seconds;
+}
+
+uint64_t date_to_total_seconds(struct date *date) {
+  uint64_t total_seconds = 0;
+
+  for (uint16_t year = 0; year < date->year; year++) {
+    total_seconds += 365 * SECONDS_PER_DAY;
+    if (date_get_is_leap_year(year)) {
+      total_seconds += SECONDS_PER_DAY;
+    }
+  }
+
+  for (uint8_t month = 1; month < date->month; month++) {
+    total_seconds += date_convert_days_to_seconds(date_get_days_of_month(month, date->year));
+  }
+
+  total_seconds += date_convert_days_to_seconds(date->day - 1);
+  total_seconds += date_convert_hms_to_seconds(date->hours, date->minutes, date->seconds);
+
+  return total_seconds;
+}
+
+uint64_t date_duration_seconds_between_2_dates(struct date *date1, struct date *date2) {
+  struct date *utc_date1 = date_copy(date1);
+  struct date *utc_date2 = date_copy(date2);
+  date_to_utc(utc_date1);
+  date_to_utc(utc_date2);
+
+  uint64_t total_seconds_date1 = date_to_total_seconds(utc_date1);
+  uint64_t total_seconds_date2 = date_to_total_seconds(utc_date2);
+
+  free(utc_date1);
+  free(utc_date2);
+
+  return total_seconds_date1 > total_seconds_date2 ? total_seconds_date1 - total_seconds_date2 : total_seconds_date2 - total_seconds_date1;
+}
+
+void date_add_hours(struct date *date, int64_t hours) {
+  if (hours == 0) {
+    return;
+  }
+  int64_t total_hours = date->hours + hours;
+  int64_t additional_days = total_hours / 24;
+  int64_t new_hours = total_hours % 24;
+
+  if (new_hours < 0) {
+    new_hours += 24;
+    additional_days -= 1;
+  }
+
+  date->hours = (uint8_t)new_hours;
+
+  if (additional_days != 0) {
+    date->day += additional_days;
+
+    while (date->day > date_get_days_of_month(date->month, date->year)) {
+      date->day -= date_get_days_of_month(date->month, date->year);
+      date->month++;
+
+      if (date->month > 12) {
+        date->month = 1;
+        date->year++;
+      }
+    }
+
+    while (date->day < 1) {
+      date->month--;
+      if (date->month < 1) {
+        date->month = 12;
+        date->year--;
+      }
+
+      date->day += date_get_days_of_month(date->month, date->year);
+    }
+  }
+}
+
+void date_add_days(struct date *date, int64_t days) {
+  date_add_hours(date, days * 24);
+}
+
+void date_to_utc(struct date *date) {
+  if (date->timezone_utc_offset == 0) {
+    return;
+  }
+  int8_t timezone_utc_offset = date->timezone_utc_offset;
+  date->timezone_utc_offset = 0;
+  date_add_hours(date, mathematics_opposite(timezone_utc_offset));
+}

lib/date.h

@@ -0,0 +1,324 @@
+#ifndef __LIBCPROJECT_DATE__
+#define __LIBCPROJECT_DATE__
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "convert.h"
+#include "mathematics.h"
+#include "string.h"
+#include "types.h"
+
+#define SECONDS_PER_MINUTE 60
+#define SECONDS_PER_HOUR (60 * SECONDS_PER_MINUTE)
+#define SECONDS_PER_DAY (24 * SECONDS_PER_HOUR)
+#define MILLISECONDS_PER_SECOND 1000
+
+/**
+ * @brief Date object representing a single moment in time.
+ * @since v4.3.0
+ */
+struct date {
+  /**
+   * Year.
+   * Between [0, 9999] (inclusive).
+   * As per ISO 8601, a four-digit year [YYYY] and represents years from 0000 to 9999, year 0000 being equal to 1 BC and all others AD.
+   */
+  uint16_t year;
+
+  /**
+   * Month.
+   * Between [1, 12] (inclusive).
+   */
+  uint8_t month;
+
+  /**
+   * Day.
+   * Between [1, 31] (inclusive).
+   */
+  uint8_t day;
+
+  /**
+   * Hours.
+   * Between [0, 23] (inclusive).
+   */
+  uint8_t hours;
+
+  /**
+   * Minutes.
+   * Between [0, 59] (inclusive).
+   */
+  uint8_t minutes;
+
+  /**
+   * Seconds.
+   * Between [0, 59] (inclusive).
+   */
+  uint8_t seconds;
+
+  /**
+   * Milliseconds.
+   * Between [0, 999] (inclusive).
+   */
+  uint16_t milliseconds;
+
+  /**
+   * Timezone UTC offset.
+   * Between [-12, 14]
+   */
+  int8_t timezone_utc_offset;
+};
+
+/**
+ * @brief Return the copy of a date.
+ *
+ * @param date
+ * @return struct date*
+ * @since v4.3.0
+ */
+struct date *date_copy(struct date *date_to_copy);
+
+/**
+ * @brief Check if a year is valid, between [0, 9999] (inclusive).
+ *
+ * @param year
+ * @return bool
+ * @since v4.3.0
+ */
+bool date_get_is_valid_year(uint16_t year);
+
+/**
+ * @brief Check if a month is valid, between [1, 12] (inclusive).
+ *
+ * @param month
+ * @return bool
+ * @since v4.3.0
+ */
+bool date_get_is_valid_month(uint8_t month);
+
+/**
+ * @brief Check if a day is valid, between [1, 31] (inclusive).
+ *
+ * @param day
+ * @return bool
+ * @since v4.3.0
+ */
+bool date_get_is_valid_day(uint8_t day);
+
+/**
+ * @brief Check if hours are valid, between [0, 23] (inclusive).
+ *
+ * @param hours
+ * @return bool
+ * @since v4.3.0
+ */
+bool date_get_is_valid_hours(uint8_t hours);
+
+/**
+ * @brief Check if minutes are valid, between [0, 59] (inclusive).
+ *
+ * @param minutes
+ * @return bool
+ * @since v4.3.0
+ */
+bool date_get_is_valid_minutes(uint8_t minutes);
+
+/**
+ * @brief Check if seconds are valid, between [0, 59] (inclusive).
+ *
+ * @param seconds
+ * @return bool
+ * @since v4.3.0
+ */
+bool date_get_is_valid_seconds(uint8_t seconds);
+
+/**
+ * @brief Check if milliseconds are valid, between [0, 999] (inclusive).
+ *
+ * @param milliseconds
+ * @return bool
+ * @since v4.3.0
+ */
+bool date_get_is_valid_milliseconds(uint16_t milliseconds);
+
+/**
+ * @brief Check if the timezone UTC offset is valid, between [-12, 14] (inclusive).
+ *
+ * @param timezone_utc_offset
+ * @return bool
+ * @since v4.3.0
+ */
+bool date_get_is_valid_timezone_utc_offset(int8_t timezone_utc_offset);
+
+/**
+ * @brief Check if the date is valid (all fields are possible).
+ *
+ * @param date
+ * @return bool
+ * @since v4.3.0
+ */
+bool date_get_is_valid(struct date *date);
+
+/**
+ * @brief String representing the date in the date time string format, a simplified format based on ISO 8601, which is always 24 characters long (`YYYY-MM-DDTHH:mm:ss.sssZ`). The timezone is always UTC, as denoted by the suffix `Z`.
+ *
+ * @param date
+ * @return string_t
+ *
+ * @code
+ * date_to_iso_string() // "2024-09-11T09:39:18.203Z"
+ * @endcode
+ *
+ * @since v4.3.0
+ */
+string_t date_to_iso_string(struct date *date);
+
+/**
+ * @brief String representing the date in the ISO 8601 format, without time information (`YYYY-MM-DD`).
+ *
+ * @param date
+ * @return string_t
+ *
+ * @code
+ * date_to_iso_string_without_time() // "2024-09-11"
+ * @endcode
+ *
+ * @since v4.3.0
+ */
+string_t date_to_iso_string_without_time(struct date *date);
+
+/**
+ * @brief Create a date from an ISO 8601 string, with the format `YYYY-MM-DDTHH:mm:ss.sssZ`.
+ *
+ * The timezone is always UTC, as denoted by the suffix `Z`.
+ *
+ * @param iso_string
+ * @return struct date*
+ * @since v4.3.0
+ */
+struct date *date_from_iso_string(string_t iso_string);
+
+/**
+ * @brief Get number of days in one month [1, 12].
+ *
+ * @param month
+ * @return uint8_t
+ * @since v4.3.0
+ */
+uint8_t date_get_days_of_month(uint8_t month, uint16_t year);
+
+/**
+ * @brief Determine if a year is a leap year.
+ *
+ * @param year
+ * @return bool
+ *
+ * @code
+ * date_is_leap_year(2020) // true
+ *
+ * date_is_leap_year(2021) // false
+ *
+ * date_is_leap_year(2022) // false
+ *
+ * date_is_leap_year(2023) // false
+ *
+ * date_is_leap_year(2024) // true
+ * @endcode
+ *
+ * @since v4.3.0
+ */
+bool date_get_is_leap_year(uint16_t year);
+
+/**
+ * @brief Convert milliseconds to seconds.
+ *
+ * @param milliseconds
+ * @return uint64_t
+ * @since v4.3.0
+ */
+uint64_t date_convert_milliseconds_to_seconds(uint16_t milliseconds);
+
+/**
+ * @brief Convert seconds to milliseconds.
+ *
+ * @param seconds
+ * @return uint64_t
+ * @since v4.3.0
+ */
+uint64_t date_convert_seconds_to_milliseconds(uint64_t seconds);
+
+/**
+ * @brief Convert days to seconds.
+ *
+ * @param days
+ * @return uint64_t
+ * @since v4.3.0
+ */
+uint64_t date_convert_days_to_seconds(uint64_t days);
+
+/**
+ * @brief Convert hours, minutes, and seconds to seconds.
+ *
+ * @param hours
+ * @param minutes
+ * @param seconds
+ * @return uint64_t
+ * @since v4.3.0
+ */
+uint64_t date_convert_hms_to_seconds(uint8_t hours, uint8_t minutes, uint8_t seconds);
+
+/**
+ * @brief Convert a date to total seconds.
+ *
+ * @param date
+ * @return uint64_t
+ * @since v4.3.0
+ */
+uint64_t date_to_total_seconds(struct date *date);
+
+/**
+ * @brief Calculate the duration in seconds between 2 dates.
+ *
+ * @param date1
+ * @param date2
+ * @return uint64_t
+ * @since v4.3.0
+ */
+uint64_t date_duration_seconds_between_2_dates(struct date *date1, struct date *date2);
+
+/**
+ * @brief Add hours to the date, managing the day, month, year changes if necessary.
+ *
+ * NOTE: Mutates the date.
+ *
+ * @param date
+ * @param hours
+ * @since v4.3.0
+ */
+void date_add_hours(struct date *date, int64_t hours);
+
+/**
+ * @brief Adds days to the date, managing month and year changes as needed.
+ *
+ * NOTE: Mutates the date.
+ *
+ * @param date The date to which days are being added.
+ * @param days The number of days to add.
+ * @since v4.3.0
+ */
+void date_add_days(struct date *date, int64_t days);
+
+/**
+ * @brief Transform the date with a Timezone UTC Offset to UTC (timezone_utc_offset = 0).
+ *
+ * NOTE: Mutates the date.
+ *
+ * @param date
+ * @since v4.3.0
+ */
+void date_to_utc(struct date *date);
+
+#endif

lib/filesystem.h

@@ -18,9 +18,10 @@
  *
  * @param path
  * @param file_content
- * @param file_size
+ * @param file_size The size of the file that was read (mutated by the function).
  * @retval -1 if the file does not exist or if there is an error.
  * @retval 0 for success.
+ * @return int
  * @since v1.0.0
  */
 int filesystem_read(string_t path, byte_t **file_content, off_t *file_size);
@@ -33,6 +34,7 @@ int filesystem_read(string_t path, byte_t **file_content, off_t *file_size);
  * @param file_size
  * @retval -1 if there is an error.
  * @retval 0 for success.
+ * @return int
  * @since v1.0.0
  */
 int filesystem_write(string_t path, byte_t *file_content, off_t file_size);
@@ -41,8 +43,8 @@ int filesystem_write(string_t path, byte_t *file_content, off_t file_size);
  * @brief Check if a path exists.
  *
  * @param path
- * @retval true if the path exists.
- * @retval false if the path does not exist.
+ * @return true
+ * @return false
  * @since v3.1.0
  */
 bool filesystem_exists(string_t path);
@@ -54,6 +56,7 @@ bool filesystem_exists(string_t path);
  * @return int
  * @retval -1 if there is an error.
  * @retval 0 for success.
+ * @return int
  * @since v3.1.0
  */
 int filesystem_remove(string_t path);
@@ -64,6 +67,7 @@ int filesystem_remove(string_t path);
  * @param path
  * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
  * @see https://www.iana.org/assignments/media-types/media-types.xhtml
+ * @return string_t
  * @since v1.0.0
  */
 string_t filesystem_get_mimetype(string_t path);

lib/hash_map.h

@@ -35,22 +35,27 @@ struct hash_map_item {
 
 /**
  * @brief Hash function (using SipHash 1-3 algorithm).
- * @param key
- * @param capacity
  * @see https://en.wikipedia.org/wiki/SipHash
  * @see https://github.com/veorq/SipHash
+ *
+ * @param key
+ * @param capacity
+ * @return uint64_t
  * @since v2.0.0
  */
 uint64_t hash(string_t key, size_t capacity);
 
 /**
  * @brief Hash map initialization.
+ *
+ * @return struct hash_map*
  * @since v2.0.0
  */
 struct hash_map *hash_map_initialization();
 
 /**
  * @brief Add an item to the hash map.
+ *
  * @param hash_map
  * @param key
  * @param data
@@ -70,14 +75,18 @@ void hash_map_remove(struct hash_map *hash_map, string_t key);
  * @brief Get an item from the hash map.
  * @param hash_map
  * @param key
+ * @return void*
  * @since v2.0.0
  */
 void *hash_map_get(struct hash_map *hash_map, string_t key);
 
 /**
  * @brief Check if the hash map contains a key.
+ *
  * @param hash_map
  * @param key
+ * @return true
+ * @return false
  * @since v2.0.0
  */
 bool hash_map_contains_key(struct hash_map *hash_map, string_t key);
@@ -86,12 +95,15 @@ bool hash_map_contains_key(struct hash_map *hash_map, string_t key);
  * @brief Get the hash map keys.
  *
  * @param hash_map
+ * @return string_t*
  * @since v2.0.0
  */
 string_t *hash_map_get_keys(struct hash_map *hash_map);
 
 /**
  * @brief Frees the hash map.
+ *
+ * @param hash_map
  * @since v3.0.0
  */
 void hash_map_free(struct hash_map *hash_map);

lib/linked_list.c

@@ -1,7 +1,7 @@
 #include "linked_list.h"
 
 struct linked_list *linked_list_initialization() {
-  struct linked_list *list = malloc(sizeof(*list));
+  struct linked_list *list = malloc(sizeof(struct linked_list));
   if (list == NULL) {
     perror("Error (linked_list_initialization)");
     exit(EXIT_FAILURE);
@@ -17,7 +17,7 @@ struct linked_list_node *linked_list_add_in_head(struct linked_list *list, void
     perror("Error (linked_list_add_in_head)");
     exit(EXIT_FAILURE);
   }
-  struct linked_list_node *node_new = malloc(sizeof(*node_new));
+  struct linked_list_node *node_new = malloc(sizeof(struct linked_list_node));
   if (node_new == NULL) {
     perror("Error (linked_list_add_in_head)");
     exit(EXIT_FAILURE);
@@ -52,7 +52,7 @@ struct linked_list_node *linked_list_add_after_last(struct linked_list *list, vo
   if (list->head == NULL) {
     return linked_list_add_in_head(list, new_data);
   }
-  struct linked_list_node *node_new = malloc(sizeof(*node_new));
+  struct linked_list_node *node_new = malloc(sizeof(struct linked_list_node));
   if (node_new == NULL) {
     perror("Error (linked_list_add_after_last)");
     exit(EXIT_FAILURE);

lib/linked_list.h

@@ -14,7 +14,6 @@
  */
 struct linked_list {
   struct linked_list_node *head;
-
   size_t length;
 };
 
@@ -29,42 +28,61 @@ struct linked_list_node {
 
 /**
  * @brief Linked list initialization.
+ *
+ * @return struct linked_list*
  * @since v1.0.0
  */
 struct linked_list *linked_list_initialization();
 
 /**
  * @brief Add a new node in the head of the linked list.
+ *
+ * @param list
+ * @param new_value
+ * @return struct linked_list_node*
  * @since v1.0.0
  */
 struct linked_list_node *linked_list_add_in_head(struct linked_list *list, void *new_value);
 
 /**
  * @brief Delete node in the head of the linked list.
+ *
+ * @param list
  * @since v1.0.0
  */
 void linked_list_delete_in_head(struct linked_list *list);
 
 /**
  * @brief Add a new node in the tail of the linked list.
+ *
+ * @param list
+ * @param new_data
+ * @return struct linked_list_node*
  * @since v1.0.0
  */
 struct linked_list_node *linked_list_add_after_last(struct linked_list *list, void *new_data);
 
 /**
  * @brief Reverse the linked list by creating a new one.
+ *
+ * @param list
+ * @return struct linked_list*
  * @since v1.0.0
  */
 struct linked_list *linked_list_reverse(struct linked_list *list);
 
 /**
  * @brief Reverse the linked list by mutating it.
+ *
+ * @param list
  * @since v1.0.0
  */
 void linked_list_reverse_mutate(struct linked_list *list);
 
 /**
  * @brief Frees the linked list.
+ *
+ * @param list
  * @since v3.0.0
  */
 void linked_list_free(struct linked_list *list);

lib/mathematics.c

@@ -32,3 +32,39 @@ float mathematics_square_root(float number) {
 unsigned long long mathematics_factorial(unsigned long long number) {
   return number == 0 ? 1 : number * mathematics_factorial(number - 1);
 }
+
+int64_t mathematics_opposite(int64_t number) {
+  return number * -1;
+}
+
+int64_t mathematics_max(int64_t number1, int64_t number2) {
+  return number1 > number2 ? number1 : number2;
+}
+
+int64_t mathematics_max_values(int64_t *values, size_t values_length) {
+  int64_t max = 0;
+  if (values_length <= 0) {
+    return max;
+  }
+  max = values[0];
+  for (size_t index = 1; index < values_length; index++) {
+    max = mathematics_max(max, values[index]);
+  }
+  return max;
+}
+
+int64_t mathematics_min(int64_t number1, int64_t number2) {
+  return number1 > number2 ? number2 : number1;
+}
+
+int64_t mathematics_min_values(int64_t *values, size_t values_length) {
+  int64_t min = 0;
+  if (values_length <= 0) {
+    return min;
+  }
+  min = values[0];
+  for (size_t index = 1; index < values_length; index++) {
+    min = mathematics_min(min, values[index]);
+  }
+  return min;
+}

lib/mathematics.h

@@ -5,6 +5,7 @@
 
 #include <errno.h>
 #include <stdbool.h>
+#include <stdlib.h>
 
 #include "types.h"
 
@@ -13,6 +14,8 @@
  *
  * @param number1
  * @param number2
+ * @return true
+ * @return false
  * @since v1.0.0
  */
 bool mathematics_equals(const float number1, const float number2);
@@ -21,6 +24,7 @@ bool mathematics_equals(const float number1, const float number2);
  * @brief Get the absolute value of a number.
  *
  * @param number
+ * @return unsigned long long
  * @since v1.0.0
  */
 unsigned long long mathematics_absolute_value(const long long number);
@@ -30,15 +34,17 @@ unsigned long long mathematics_absolute_value(const long long number);
  *
  * @param base
  * @param exponent
+ * @return unsigned long long
  * @since v1.0.0
  */
 unsigned long long mathematics_pow(unsigned long long base, unsigned long long exponent);
 
 /**
- * @brief Calculates the nth root of a number using Heron's method.
+ * @brief Calculates the nth root of a number.
  *
  * @param number
  * @param nth_root
+ * @return float
  * @since v1.0.0
  */
 float mathematics_root(float number, unsigned int nth_root);
@@ -47,6 +53,7 @@ float mathematics_root(float number, unsigned int nth_root);
  * @brief Calculates the square root of a number using Heron's method.
  *
  * @param number
+ * @return float
  * @since v1.0.0
  */
 float mathematics_square_root(float number);
@@ -55,8 +62,64 @@ float mathematics_square_root(float number);
  * @brief Calculates the factorial of a number.
  *
  * @param number
+ * @return unsigned long long
  * @since v1.0.0
  */
 unsigned long long mathematics_factorial(unsigned long long number);
 
+/**
+ * @brief Calulcates the opposite number (additive inverse).
+ *
+ * @param number
+ * @return int64_t
+ *
+ * @code
+ * mathematics_opposite(7) // -7
+ *
+ * mathematics_opposite(-7) // 7
+ * @endcode
+ * @since v4.3.0
+ */
+int64_t mathematics_opposite(int64_t number);
+
+/**
+ * @brief Returns the largest number between 2 numbers.
+ *
+ * @param number1
+ * @param number2
+ * @return int64_t
+ * @since v4.3.0
+ */
+int64_t mathematics_max(int64_t number1, int64_t number2);
+
+/**
+ * @brief Returns the largest number between multiple numbers. If the array is empty, returns 0.
+ *
+ * @param values
+ * @param values_length
+ * @return int64_t
+ * @since v4.3.0
+ */
+int64_t mathematics_max_values(int64_t *values, size_t values_length);
+
+/**
+ * @brief Returns the smallest number between 2 numbers.
+ *
+ * @param number1
+ * @param number2
+ * @return int64_t
+ * @since v4.3.0
+ */
+int64_t mathematics_min(int64_t number1, int64_t number2);
+
+/**
+ * @brief Returns the smallest number between multiple numbers. If the array is empty, returns 0.
+ *
+ * @param values
+ * @param values_length
+ * @return int64_t
+ * @since v4.3.0
+ */
+int64_t mathematics_min_values(int64_t *values, size_t values_length);
+
 #endif

lib/queue.c

@@ -1,7 +1,7 @@
 #include "queue.h"
 
 struct queue *queue_initialization() {
-  struct queue *queue = malloc(sizeof(*queue));
+  struct queue *queue = malloc(sizeof(struct queue));
   if (queue == NULL) {
     perror("Error (queue_initialization)");
     exit(EXIT_FAILURE);
@@ -17,7 +17,7 @@ void queue_push(struct queue *queue, void *data) {
     perror("Error (queue_push)");
     exit(EXIT_FAILURE);
   }
-  struct queue_node *node_new = malloc(sizeof(*node_new));
+  struct queue_node *node_new = malloc(sizeof(struct queue_node));
   if (node_new == NULL) {
     perror("Error (queue_push)");
     exit(EXIT_FAILURE);

lib/queue.h

@@ -27,24 +27,34 @@ struct queue_node {
 
 /**
  * @brief Queue initialization.
+ *
+ * @return struct queue*
  * @since v1.0.0
  */
 struct queue *queue_initialization();
 
 /**
  * @brief Push data to queue.
+ *
+ * @param queue
+ * @param data
  * @since v1.0.0
  */
 void queue_push(struct queue *queue, void *data);
 
 /**
  * @brief Pop data from queue.
+ *
+ * @param queue
+ * @return void*
  * @since v1.0.0
  */
 void *queue_pop(struct queue *queue);
 
 /**
  * @brief Frees the queue.
+ *
+ * @param queue
  * @since v3.0.0
  */
 void queue_free(struct queue *queue);

lib/stack.c

@@ -1,7 +1,7 @@
 #include "stack.h"
 
 struct stack *stack_initialization() {
-  struct stack *stack = malloc(sizeof(*stack));
+  struct stack *stack = malloc(sizeof(struct stack));
   if (stack == NULL) {
     perror("Error (stack_initialization)");
     exit(EXIT_FAILURE);
@@ -17,7 +17,7 @@ void stack_push(struct stack *stack, void *data) {
     perror("Error (stack_push)");
     exit(EXIT_FAILURE);
   }
-  struct stack_node *node_new = malloc(sizeof(*node_new));
+  struct stack_node *node_new = malloc(sizeof(struct stack_node));
   if (data == NULL) {
     perror("Error (stack_push)");
     exit(EXIT_FAILURE);

lib/stack.h

@@ -27,24 +27,34 @@ struct stack_node {
 
 /**
  * @brief Stack initialization.
+ *
+ * @return struct stack*
  * @since v1.0.0
  */
 struct stack *stack_initialization();
 
 /**
  * @brief Push data to stack.
+ *
+ * @param stack
+ * @param data
  * @since v1.0.0
  */
 void stack_push(struct stack *stack, void *data);
 
 /**
  * @brief Pop data from stack.
+ *
+ * @param stack
+ * @return void*
  * @since v1.0.0
  */
 void *stack_pop(struct stack *stack);
 
 /**
  * @brief Frees the stack.
+ *
+ * @param stack
  * @since v3.0.0
  */
 void stack_free(struct stack *stack);

lib/string.c

@@ -37,6 +37,20 @@ void string_replace(string_t string, char search, char replace) {
   string[string_length] = '\0';
 }
 
+void string_remove_character(string_t string, char search) {
+  size_t string_length = string_get_length(string);
+  for (size_t index = 0; index < string_length; index++) {
+    if (string[index] == search) {
+      for (size_t index_string = index; index_string < string_length; index_string++) {
+        string[index_string] = string[index_string + 1];
+      }
+      string_length--;
+      index--;
+    }
+  }
+  string[string_length] = '\0';
+}
+
 void string_trim_start(string_t string, char character) {
   size_t string_length = string_get_length(string);
   size_t index_space = 0;
@@ -370,3 +384,59 @@ bool string_ends_with(const string_t string, const string_t prefix) {
   }
   return ends_with;
 }
+
+size_t string_position_of(const string_t string, const char character) {
+  size_t position_found = 0;
+  size_t string_length = string_get_length(string);
+  for (size_t index = 0; index < string_length && position_found == 0; index++) {
+    if (string[index] == character) {
+      position_found = index + 1;
+    }
+  }
+  return position_found;
+}
+
+size_t string_last_position_of(const string_t string, const char character) {
+  size_t position_found = 0;
+  size_t string_length = string_get_length(string);
+  while (string_length > 0 && position_found == 0) {
+    if (string[string_length - 1] == character) {
+      position_found = string_length;
+    }
+    string_length--;
+  }
+  return position_found;
+}
+
+string_t string_pad_start(const string_t string, const string_t pad_string, size_t target_length) {
+  string_t result = malloc(sizeof(char) * (target_length + 1));
+  size_t initial_length = string_get_length(string);
+  size_t left_length = target_length - initial_length;
+  if (target_length <= initial_length) {
+    left_length = 0;
+  }
+  size_t pad_length = string_get_length(pad_string);
+  size_t count_pad_string = 0;
+  size_t index_initial_string = 0;
+  for (size_t index = 0; index < target_length; index++) {
+    if (index < left_length) {
+      size_t index_pad_string = count_pad_string % pad_length;
+      result[index] = pad_string[index_pad_string];
+      count_pad_string += 1;
+    } else {
+      result[index] = string[index_initial_string];
+      index_initial_string += 1;
+    }
+  }
+  result[target_length] = '\0';
+  return result;
+}
+
+string_t string_zero_pad(uint64_t number, size_t places) {
+  string_t number_string = convert_number_to_string((long long)number);
+  string_t pad_string = string_copy("0");
+  string_t result = string_pad_start(number_string, pad_string, places);
+  free(pad_string);
+  free(number_string);
+  return result;
+}

lib/string.h

@@ -15,6 +15,7 @@
  * @brief Return the length of a string (excluding '\0').
  *
  * @param string
+ * @return size_t
  * @since v1.0.0
  */
 size_t string_get_length(const string_t string);
@@ -51,6 +52,17 @@ void string_to_lowercase(string_t string);
  */
 void string_replace(string_t string, char search, char replace);
 
+/**
+ * @brief Removes all the occurrences of a character in a string.
+ *
+ * NOTE: Mutates the string.
+ *
+ * @param string
+ * @param search A character search value.
+ * @since v4.1.0
+ */
+void string_remove_character(string_t string, char search);
+
 /**
  * @brief Removes all `character` from the start of a string.
  *
@@ -85,6 +97,7 @@ void string_trim(string_t string, char character);
  * @brief Return the copy of a string.
  *
  * @param string
+ * @return string_t
  * @since v1.0.0
  */
 string_t string_copy(const string_t string);
@@ -104,6 +117,7 @@ void string_capitalize(string_t string);
  *
  * @param string
  * @param character
+ * @return size_t
  * @since v1.0.0
  */
 size_t string_total_occurrences_of_character(string_t string, char character);
@@ -123,16 +137,18 @@ void string_reverse(const string_t string);
  *
  * @param string1
  * @param string2
- * @return true if the strings are equals, false otherwise.
+ * @return true if the strings are equals.
+ * @return false if the strings are not equals.
  * @since v1.0.0
  */
 bool string_equals(const string_t string1, const string_t string2);
 
 /**
- * @brief Check if the string is a integer.
+ * @brief Check if the string is an integer.
  *
  * @param string
- * @return true if the string is a integer, false otherwise.
+ * @return true if the string is an integer.
+ * @return false if the string is not an integer.
  * @since v1.0.0
  */
 bool string_get_is_integer(const string_t string);
@@ -143,6 +159,7 @@ bool string_get_is_integer(const string_t string);
  * @param string
  * @param separator
  * @param result_size
+ * @return string_t*
  * @since v1.0.0
  */
 string_t* string_split(const string_t string, char separator, size_t* result_size);
@@ -153,6 +170,7 @@ string_t* string_split(const string_t string, char separator, size_t* result_siz
  * @param array
  * @param separator
  * @param array_length
+ * @return string_t
  * @since v1.0.0
  */
 string_t string_join(string_t* array, const char separator, size_t array_length);
@@ -172,7 +190,8 @@ void string_concatenate(string_t* destination, string_t source);
  * @brief Check if a string contains only unique characters.
  *
  * @param string
- * @return true if string contains only unique characters, false otherwise.
+ * @return true if string contains only unique characters.
+ * @return false if string contains duplicate characters.
  * @since v1.0.0
  */
 bool string_get_has_unique_characters(const string_t string);
@@ -183,6 +202,7 @@ bool string_get_has_unique_characters(const string_t string);
  * @param string
  * @param index_start
  * @param index_end
+ * @return string_t
  * @since v1.0.0
  */
 string_t string_substring(const string_t string, size_t index_start, size_t index_end);
@@ -192,7 +212,8 @@ string_t string_substring(const string_t string, size_t index_start, size_t inde
  *
  * @param string
  * @param substring
- * @return true if the string contains the substring, false otherwise.
+ * @return true if the string contains the substring.
+ * @return false if the string does not contain the substring.
  * @since v1.0.0
  */
 bool string_get_is_substring(const string_t string, const string_t substring);
@@ -202,11 +223,14 @@ bool string_get_is_substring(const string_t string, const string_t substring);
  *
  * @param number
  * @param separator
- * @since v1.0.0
+ * @return string_t
+ *
  * @code
  * string_get_formatted_number(1000, " ") // "1 000"
+ *
  * string_get_formatted_number(1000, ",") // "1,000"
  * @endcode
+ * @since v1.0.0
  */
 string_t string_get_formatted_number(const long long number, string_t separator);
 
@@ -215,6 +239,7 @@ string_t string_get_formatted_number(const long long number, string_t separator)
  *
  * @param string
  * @param character
+ * @return string_t
  * @since v1.0.0
  */
 string_t string_get_last_occurence_of_character(const string_t string, char character);
@@ -224,7 +249,8 @@ string_t string_get_last_occurence_of_character(const string_t string, char char
  *
  * @param string
  * @param prefix
- * @return true if the string starts with the substring, false otherwise.
+ * @return true if the string starts with the substring.
+ * @return false if the string does not start with the substring.
  * @since v1.0.0
  */
 bool string_starts_with(const string_t string, const string_t prefix);
@@ -234,9 +260,69 @@ bool string_starts_with(const string_t string, const string_t prefix);
  *
  * @param string
  * @param prefix
- * @return true if the string ends with the substring, false otherwise.
+ * @return true if the string ends with the substring.
+ * @return false if the string does not end with the substring.
  * @since v1.0.0
  */
 bool string_ends_with(const string_t string, const string_t prefix);
 
+/**
+ * @brief Returns the position (index + 1) within the string of the first occurrence of the specified substring (0 if not found).
+ *
+ * @param string
+ * @param substring
+ * @return size_t
+ *
+ * @code
+ * string_position_of("hello world", 'e') // 2
+ * @endcode
+ * @since v4.2.0
+ */
+size_t string_position_of(const string_t string, const char character);
+
+/**
+ * @brief Returns the position (index + 1) within the string of the last occurrence of the specified substring (0 if not found).
+ *
+ * @param string
+ * @param character
+ * @return size_t
+ *
+ * @code
+ * string_last_position_of("hello world", 'o') // 8
+ * @endcode
+ * @since v4.2.0
+ */
+size_t string_last_position_of(const string_t string, const char character);
+
+/**
+ * @brief Pads a `string` with another `pad_string` (multiple times, if needed) until the resulting string reaches the `target_length`. The padding is applied from the start (left) of the string.
+ *
+ * @param string The string to pad.
+ * @param pad_string The string to pad the current string with, to the left.
+ * @param target_length
+ * @return string_t
+ *
+ * @code
+ * string_pad_start("hello", " ", 10) // "     hello"
+ * @endcode
+ * @since v4.3.0
+ */
+string_t string_pad_start(const string_t string, const string_t pad_string, size_t target_length);
+
+/**
+ * @brief Pad a number with zeros.
+ *
+ * @param number
+ * @param places
+ * @return string_t
+ *
+ * @code
+ * string_zero_pad(1, 2) // "01"
+ *
+ * string_zero_pad(10, 2) // "10"
+ * @endcode
+ * @since v4.3.0
+ */
+string_t string_zero_pad(uint64_t number, size_t places);
+
 #endif

lib/terminal.c

@@ -24,7 +24,7 @@ string_t terminal_input() {
 void terminal_print_array(void* array, size_t array_size, size_t element_size, void (*print_element)(void*)) {
   printf("[");
   for (size_t index = 0; index < array_size; index++) {
-    void* element = (char*)array + index * element_size;
+    void* element = (string_t)array + index * element_size;
     print_element(element);
     bool is_last = index == array_size - 1;
     if (!is_last) {
@@ -47,11 +47,11 @@ void terminal_print_unsigned_long(void* value) {
 }
 
 void terminal_print_char(void* value) {
-  printf("%c", *(char*)value);
+  printf("%c", *(string_t)value);
 }
 
 void terminal_print_string(void* value) {
-  printf("%s", (char*)value);
+  printf("%s", (string_t)value);
 }
 
 void terminal_print_stack(struct stack* stack, void (*print_element)(void*)) {
@@ -63,7 +63,7 @@ void terminal_print_stack(struct stack* stack, void (*print_element)(void*)) {
   struct stack_node* node_current = stack->first;
   while (node_current != NULL) {
     printf("|\t");
-    void* element = (char*)node_current->data;
+    void* element = node_current->data;
     print_element(&element);
     node_current = node_current->next;
     printf("\t|\n");
@@ -79,7 +79,7 @@ void terminal_print_queue(struct queue* queue, void (*print_element)(void*)) {
   struct queue_node* node_current = queue->first;
   while (node_current != NULL) {
     printf("|\t");
-    void* element = (char*)node_current->data;
+    void* element = node_current->data;
     print_element(&element);
     node_current = node_current->next;
     printf("\t|\n");
@@ -94,7 +94,7 @@ void terminal_print_linked_list(struct linked_list* linked_list, void (*print_el
   }
   struct linked_list_node* node_current = linked_list->head;
   while (node_current != NULL) {
-    void* element = (char*)node_current->data;
+    void* element = (string_t)node_current->data;
     node_current = node_current->next;
     print_element(&element);
     printf(" -> ");

lib/terminal.h

@@ -17,6 +17,8 @@
 
 /**
  * @brief Read a line from stdin.
+ *
+ * @return string_t
  * @since v1.0.0
  */
 string_t terminal_input();
@@ -111,7 +113,7 @@ void terminal_print_hash_map(struct hash_map* hash_map, void (*print_element)(vo
 /**
  * @brief Print an array list.
  *
- * @param array_list
+ * @param list
  * @param print_element
  * @since v3.0.0
  */

libcproject.h

@@ -4,6 +4,7 @@
 #include "lib/array_list.h"
 #include "lib/character.h"
 #include "lib/convert.h"
+#include "lib/date.h"
 #include "lib/filesystem.h"
 #include "lib/hash_map.h"
 #include "lib/linked_list.h"

set_version.c

@@ -3,7 +3,7 @@
 
 #include "libcproject.h"
 
-int main(int argc, char** argv) {
+int main(int argc, string_t* argv) {
   if (argc != 2) {
     fprintf(stderr, "Usage: %s <version>\n", argv[0]);
     return EXIT_FAILURE;
@@ -16,6 +16,7 @@ int main(int argc, char** argv) {
   int result = filesystem_write("./version.h", (byte_t*)content, string_get_length(content));
   if (result == -1) {
     fprintf(stderr, "Error: Could not write to file.\n");
+    perror("Error (set_version)");
     return EXIT_FAILURE;
   }
   printf("Success: Version set to %s.\n", argv[1]);

test/array_list_test.c

@@ -34,4 +34,15 @@ void array_list_test() {
   assert(array_list_get(list, 100) == (void *)95);
 
   array_list_free(list);
+
+  list = array_list_initialization();
+  array_list_add(list, (void *)'a');
+  array_list_add(list, (void *)'b');
+  array_list_add(list, (void *)'c');
+  array_list_remove(list, 1);
+  assert(array_list_get(list, 0) == (void *)'a');
+  assert(array_list_get(list, 1) == (void *)'c');
+  assert(list->size == 2);
+
+  array_list_free(list);
 }

test/convert_test.c

@@ -10,7 +10,7 @@ void convert_test() {
 }
 
 void convert_character_to_string_test() {
-  char* result = convert_character_to_string('a');
+  string_t result = convert_character_to_string('a');
   assert(assert_string_equal(result, "a"));
   free(result);
 
@@ -77,7 +77,7 @@ void convert_string_to_number_test() {
 }
 
 void convert_number_to_string_test() {
-  char* result = convert_number_to_string(0);
+  string_t result = convert_number_to_string(0);
   assert(assert_string_equal(result, "0"));
   free(result);
 
@@ -143,7 +143,7 @@ void convert_number_to_string_test() {
 }
 
 void convert_number_from_base_to_another_test() {
-  char* result = convert_number_from_base_to_another("15", 10, 16);
+  string_t result = convert_number_from_base_to_another("15", 10, 16);
   assert(assert_string_equal(result, "F"));
   free(result);
 

test/date_test.c

@@ -0,0 +1,164 @@
+#include "date_test.h"
+
+void date_test() {
+  date_copy_test();
+  date_to_iso_string_test();
+  date_to_iso_string_without_time_test();
+  date_from_iso_string_test();
+  date_get_is_leap_year_test();
+  date_duration_seconds_between_2_dates_test();
+  date_to_utc_test();
+}
+
+void date_copy_test() {
+  struct date *date = malloc(sizeof(struct date));
+  date->year = 2024;
+  date->month = 9;
+  date->day = 10;
+  date->hours = 20;
+  date->minutes = 34;
+  date->seconds = 25;
+  date->milliseconds = 76;
+  date->timezone_utc_offset = 0;
+
+  struct date *date2 = date_copy(date);
+  assert(date != date2);
+  assert(date->year == date2->year);
+  assert(date->month == date2->month);
+  assert(date->day == date2->day);
+  assert(date->hours == date2->hours);
+  assert(date->minutes == date2->minutes);
+  assert(date->seconds == date2->seconds);
+  assert(date->milliseconds == date2->milliseconds);
+  assert(date->timezone_utc_offset == date2->timezone_utc_offset);
+
+  date->year = 2025;
+  assert(date->year == 2025);
+  assert(date2->year == 2024);
+
+  free(date);
+  free(date2);
+}
+
+void date_to_iso_string_test() {
+  struct date *date = malloc(sizeof(struct date));
+  date->year = 2024;
+  date->month = 9;
+  date->day = 10;
+  date->hours = 20;
+  date->minutes = 34;
+  date->seconds = 25;
+  date->milliseconds = 76;
+  date->timezone_utc_offset = 0;
+
+  string_t iso_string = date_to_iso_string(date);
+  assert(assert_string_equal(iso_string, "2024-09-10T20:34:25.076Z"));
+  free(iso_string);
+
+  free(date);
+}
+
+void date_to_iso_string_without_time_test() {
+  struct date *date = malloc(sizeof(struct date));
+  date->year = 2024;
+  date->month = 9;
+  date->day = 10;
+  date->hours = 20;
+  date->minutes = 34;
+  date->seconds = 25;
+  date->milliseconds = 76;
+  date->timezone_utc_offset = 0;
+
+  string_t iso_string = date_to_iso_string_without_time(date);
+  assert(assert_string_equal(iso_string, "2024-09-10"));
+  free(iso_string);
+
+  free(date);
+}
+
+void date_from_iso_string_test() {
+  string_t iso_string = "2024-09-10T20:34:25.076Z";
+  struct date *date = date_from_iso_string(iso_string);
+  assert(date->year == 2024);
+  assert(date->month == 9);
+  assert(date->day == 10);
+  assert(date->hours == 20);
+  assert(date->minutes == 34);
+  assert(date->seconds == 25);
+  assert(date->milliseconds == 76);
+  assert(date->timezone_utc_offset == 0);
+
+  free(date);
+}
+
+void date_get_is_leap_year_test() {
+  assert(date_get_is_leap_year(2020));
+  assert(!date_get_is_leap_year(2021));
+  assert(!date_get_is_leap_year(2022));
+  assert(!date_get_is_leap_year(2023));
+  assert(date_get_is_leap_year(2024));
+}
+
+void date_duration_seconds_between_2_dates_test() {
+  struct date *date1 = date_from_iso_string("2024-09-10T20:34:25.076Z");
+  struct date *date2 = date_from_iso_string("2024-09-10T20:34:25.076Z");
+  assert(date_duration_seconds_between_2_dates(date1, date2) == 0);
+  free(date1);
+  free(date2);
+
+  date1 = date_from_iso_string("2024-09-10T20:34:25.076Z");
+  date2 = date_from_iso_string("2024-09-10T23:34:26.076Z");
+  assert(date_duration_seconds_between_2_dates(date1, date2) == 10801);
+  free(date1);
+  free(date2);
+
+  date1 = date_from_iso_string("2024-09-10T20:34:25.076Z");
+  date2 = date_from_iso_string("2024-09-10T20:48:25.076Z");
+  assert(date_duration_seconds_between_2_dates(date1, date2) == 840);
+  free(date1);
+  free(date2);
+
+  date1 = date_from_iso_string("2024-09-10T20:34:25.076Z");
+  date2 = date_from_iso_string("2024-09-10T20:34:38.076Z");
+  assert(date_duration_seconds_between_2_dates(date1, date2) == 13);
+  free(date1);
+  free(date2);
+}
+
+void date_to_utc_test() {
+  struct date *date = date_from_iso_string("2024-09-10T20:34:25.076Z");
+  date->timezone_utc_offset = 3;
+  date_to_utc(date);
+  assert(date->timezone_utc_offset == 0);
+  string_t iso_string = date_to_iso_string(date);
+  assert(assert_string_equal(iso_string, "2024-09-10T17:34:25.076Z"));
+  free(iso_string);
+  free(date);
+
+  date = date_from_iso_string("2024-09-10T20:34:25.076Z");
+  date->timezone_utc_offset = -3;
+  date_to_utc(date);
+  assert(date->timezone_utc_offset == 0);
+  iso_string = date_to_iso_string(date);
+  assert(assert_string_equal(iso_string, "2024-09-10T23:34:25.076Z"));
+  free(iso_string);
+  free(date);
+
+  date = date_from_iso_string("2024-01-01T00:00:00.000Z");
+  date->timezone_utc_offset = 3;
+  date_to_utc(date);
+  assert(date->timezone_utc_offset == 0);
+  iso_string = date_to_iso_string(date);
+  assert(assert_string_equal(iso_string, "2023-12-31T21:00:00.000Z"));
+  free(iso_string);
+  free(date);
+
+  date = date_from_iso_string("2023-12-31T21:00:00.000Z");
+  date->timezone_utc_offset = -4;
+  date_to_utc(date);
+  assert(date->timezone_utc_offset == 0);
+  iso_string = date_to_iso_string(date);
+  assert(assert_string_equal(iso_string, "2024-01-01T01:00:00.000Z"));
+  free(iso_string);
+  free(date);
+}

test/date_test.h

@@ -0,0 +1,25 @@
+#ifndef __DATE_TEST__
+#define __DATE_TEST__
+
+#include <assert.h>
+
+#include "libcproject.h"
+#include "test.h"
+
+void date_test();
+
+void date_copy_test();
+
+void date_to_iso_string_test();
+
+void date_to_iso_string_without_time_test();
+
+void date_from_iso_string_test();
+
+void date_get_is_leap_year_test();
+
+void date_duration_seconds_between_2_dates_test();
+
+void date_to_utc_test();
+
+#endif

test/main.c

@@ -4,6 +4,7 @@
 #include "array_list_test.h"
 #include "character_test.h"
 #include "convert_test.h"
+#include "date_test.h"
 #include "hash_map_test.h"
 #include "linked_list_test.h"
 #include "mathematics_test.h"
@@ -15,6 +16,7 @@ int main() {
   array_list_test();
   character_test();
   convert_test();
+  date_test();
   hash_map_test();
   linked_list_test();
   mathematics_test();

test/mathematics_test.c

@@ -6,6 +6,11 @@ void mathematics_test() {
   mathematics_root_test();
   mathematics_square_root_test();
   mathematics_factorial_test();
+  mathematics_opposite_test();
+  mathematics_max_test();
+  mathematics_max_values_test();
+  mathematics_min_test();
+  mathematics_min_values_test();
 }
 
 void mathematics_absolute_value_test() {
@@ -56,3 +61,38 @@ void mathematics_factorial_test() {
   assert(mathematics_factorial(9) == 362880);
   assert(mathematics_factorial(10) == 3628800);
 }
+
+void mathematics_opposite_test() {
+  assert(mathematics_opposite(-7) == 7);
+  assert(mathematics_opposite(7) == -7);
+}
+
+void mathematics_max_test() {
+  assert(mathematics_max(0, 0) == 0);
+  assert(mathematics_max(0, 1) == 1);
+  assert(mathematics_max(2, 0) == 2);
+  assert(mathematics_max(54, 37) == 54);
+}
+
+void mathematics_max_values_test() {
+  int64_t values[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+  assert(mathematics_max_values(values, 10) == 9);
+
+  int64_t values2[] = {8, 6, 4, 7};
+  assert(mathematics_max_values(values2, 4) == 8);
+}
+
+void mathematics_min_test() {
+  assert(mathematics_min(0, 0) == 0);
+  assert(mathematics_min(3, 5) == 3);
+  assert(mathematics_min(2, 1) == 1);
+  assert(mathematics_min(54, 37) == 37);
+}
+
+void mathematics_min_values_test() {
+  int64_t values[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+  assert(mathematics_min_values(values, 10) == 0);
+
+  int64_t values2[] = {9, 6, 8, 7};
+  assert(mathematics_min_values(values2, 4) == 6);
+}

test/mathematics_test.h

@@ -17,4 +17,14 @@ void mathematics_square_root_test();
 
 void mathematics_factorial_test();
 
+void mathematics_opposite_test();
+
+void mathematics_max_test();
+
+void mathematics_max_values_test();
+
+void mathematics_min_test();
+
+void mathematics_min_values_test();
+
 #endif

test/string_test.c

@@ -5,6 +5,7 @@ void string_test() {
   string_to_uppercase_test();
   string_to_lowercase_test();
   string_replace_test();
+  string_remove_character_test();
   string_trim_start_test();
   string_trim_end_test();
   string_trim_test();
@@ -24,6 +25,10 @@ void string_test() {
   string_get_last_occurence_of_character_test();
   string_starts_with_test();
   string_ends_with_test();
+  string_position_of_test();
+  string_last_position_of_test();
+  string_pad_start_test();
+  string_zero_pad_test();
 }
 
 void string_get_length_test() {
@@ -54,6 +59,13 @@ void string_replace_test() {
   free(string);
 }
 
+void string_remove_character_test() {
+  string_t string = string_copy("hello world");
+  string_remove_character(string, 'l');
+  assert(assert_string_equal(string, "heo word"));
+  free(string);
+}
+
 void string_trim_start_test() {
   string_t string = string_copy("      hello world      ");
   string_trim_start(string, ' ');
@@ -195,7 +207,7 @@ void string_get_is_substring_test() {
 }
 
 void string_get_formatted_number_test() {
-  char* result = string_get_formatted_number(1000, " ");
+  string_t result = string_get_formatted_number(1000, " ");
   assert(assert_string_equal(result, "1 000"));
   free(result);
 
@@ -227,7 +239,7 @@ void string_get_formatted_number_test() {
 void string_get_last_occurence_of_character_test() {
   string_t string = "abcdef";
 
-  char* result = string_get_last_occurence_of_character(string, 'a');
+  string_t result = string_get_last_occurence_of_character(string, 'a');
   assert(assert_string_equal(result, "abcdef"));
   free(result);
 
@@ -269,3 +281,55 @@ void string_ends_with_test() {
   assert(!string_ends_with("abcdef", "bcd"));
   assert(!string_ends_with("abcdef", "abcdefg"));
 }
+
+void string_position_of_test() {
+  assert(string_position_of("hello world", 'e') == 2);
+  assert(string_position_of("hello world", 'o') == 5);
+  assert(string_position_of("abcdef", 'a') == 1);
+  assert(string_position_of("abcdef", 'b') == 2);
+  assert(string_position_of("abcdef", 'c') == 3);
+  assert(string_position_of("abcdef", 'd') == 4);
+  assert(string_position_of("abcdef", 'e') == 5);
+  assert(string_position_of("abcdef", 'f') == 6);
+  assert(string_position_of("abcdef", 'g') == 0);
+}
+
+void string_last_position_of_test() {
+  assert(string_last_position_of("hello world", 'e') == 2);
+  assert(string_last_position_of("hello world", 'o') == 8);
+  assert(string_last_position_of("abcdef", 'a') == 1);
+  assert(string_last_position_of("abcdef", 'b') == 2);
+  assert(string_last_position_of("abcdef", 'c') == 3);
+  assert(string_last_position_of("abcdef", 'd') == 4);
+  assert(string_last_position_of("abcdef", 'e') == 5);
+  assert(string_last_position_of("abcdef", 'f') == 6);
+  assert(string_last_position_of("abcdef", 'g') == 0);
+}
+
+void string_pad_start_test() {
+  string_t result = string_pad_start("hello", "ab", 10);
+  assert(assert_string_equal(result, "ababahello"));
+  free(result);
+
+  result = string_pad_start("hello", "ab", 4);
+  assert(assert_string_equal(result, "hell"));
+  free(result);
+
+  result = string_pad_start("hello", "ab", 5);
+  assert(assert_string_equal(result, "hello"));
+  free(result);
+
+  result = string_pad_start("hello", "ab", 6);
+  assert(assert_string_equal(result, "ahello"));
+  free(result);
+}
+
+void string_zero_pad_test() {
+  string_t result = string_zero_pad(1, 2);
+  assert(assert_string_equal(result, "01"));
+  free(result);
+
+  result = string_zero_pad(10, 2);
+  assert(assert_string_equal(result, "10"));
+  free(result);
+}

test/string_test.h

@@ -18,6 +18,8 @@ void string_to_lowercase_test();
 
 void string_replace_test();
 
+void string_remove_character_test();
+
 void string_trim_start_test();
 
 void string_trim_end_test();
@@ -56,4 +58,12 @@ void string_starts_with_test();
 
 void string_ends_with_test();
 
+void string_position_of_test();
+
+void string_last_position_of_test();
+
+void string_pad_start_test();
+
+void string_zero_pad_test();
+
 #endif

version.h

@@ -1,4 +1,4 @@
 #ifndef __LIBCPROJECT_VERSION__
-#define __LIBCPROJECT_VERSION__ "4.0.0"
+#define __LIBCPROJECT_VERSION__ "4.3.0"
 
 #endif