diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e1382f9..1354716 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -2,6 +2,14 @@
 
 Thanks a lot for your interest in contributing to **libcproject**! 🎉
 
+## Code of Conduct
+
+**libcproject** adopted the [Contributor Covenant](https://www.contributor-covenant.org/) as its Code of Conduct, and we expect project participants to adhere to it. Please read [the full text](./CODE_OF_CONDUCT.md) so that you can understand what actions will and will not be tolerated.
+
+## Open Development
+
+All work on **libcproject** happens directly on this repository. Both core team members and external contributors send pull requests which go through the same review process.
+
 ## Types of contributions
 
 - Reporting a bug.
@@ -21,26 +29,4 @@ If you're adding new features to **libcproject**, please include tests.
 
 ## Commits
 
-The commit message guidelines respect [@commitlint/config-conventional](https://github.com/conventional-changelog/commitlint/tree/master/%40commitlint/config-conventional) and [Semantic Versioning](https://semver.org/) for releases.
-
-### Types
-
-Types define which kind of changes you made to the project.
-
-| Types    | Description                                                                                                  |
-| -------- | ------------------------------------------------------------------------------------------------------------ |
-| feat     | A new feature.                                                                                               |
-| fix      | A bug fix.                                                                                                   |
-| docs     | Documentation only changes.                                                                                  |
-| style    | Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc).      |
-| refactor | A code change that neither fixes a bug nor adds a feature.                                                   |
-| perf     | A code change that improves performance.                                                                     |
-| test     | Adding missing tests or correcting existing tests.                                                           |
-| build    | Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm).         |
-| ci       | Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs). |
-| chore    | Other changes that don't modify src or test files.                                                           |
-| revert   | Reverts a previous commit.                                                                                   |
-
-### Scopes
-
-Scopes define what part of the code changed.
+The commit message guidelines adheres to [Conventional Commits](https://www.conventionalcommits.org/) and [Semantic Versioning](https://semver.org/) for releases.
diff --git a/Doxyfile b/Doxyfile
index 4ea2536..067d349 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -8,7 +8,10 @@ INPUT = ./
 INPUT_ENCODING = UTF-8
 USE_MDFILE_AS_MAINPAGE = README.md
 FILE_PATTERNS = *.h \
-  README.md
+  README.md \
+  CODE_OF_CONDUCT.md \
+  CONTRIBUTING.md \
+  LICENSE
 HTML_EXTRA_STYLESHEET  = doxygen-awesome-css/doxygen-awesome.css
 
 RECURSIVE = YES
diff --git a/lib/character.h b/lib/character.h
index 9bfeaa2..4a02587 100644
--- a/lib/character.h
+++ b/lib/character.h
@@ -11,7 +11,7 @@
  * @brief Append a character to a string, assuming string points to an array
  * with enough space.
  *
- * @param string
+ * @param string_value
  * @param character
  * @since v1.0.0
  */
@@ -20,7 +20,7 @@ void character_append(string_t string_value, char character);
 /**
  * @brief Append a character to a string at a specific index, assuming string points to an array with enough space.
  *
- * @param string
+ * @param string_value
  * @param character
  * @param index
  * @since v1.0.0
@@ -46,8 +46,6 @@ 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').
  *
- * @param string1
- * @param string2
  * @return true if the character is a digit, false otherwise
  * @since v1.0.0
  */
diff --git a/lib/convert.h b/lib/convert.h
index 4de8b64..aaac456 100644
--- a/lib/convert.h
+++ b/lib/convert.h
@@ -37,7 +37,7 @@ char convert_digit_to_character(const char digit);
 /**
  * @brief Convert a string to a number.
  *
- * @param string
+ * @param string_value
  * @since v1.0.0
  */
 long long convert_string_to_number(const string_t string_value);
diff --git a/lib/hash_map.h b/lib/hash_map.h
index 178588b..8981601 100644
--- a/lib/hash_map.h
+++ b/lib/hash_map.h
@@ -34,9 +34,10 @@ struct hash_map_item {
 
 /**
  * @brief Hash function (using SipHash 1-3 algorithm).
- * @link https://en.wikipedia.org/wiki/SipHash
  * @param key
  * @param capacity
+ * @see https://en.wikipedia.org/wiki/SipHash
+ * @see https://github.com/veorq/SipHash
  * @since v2.0.0
  */
 uint64_t hash(string_t key, size_t capacity);
diff --git a/lib/string.h b/lib/string.h
index c1b27f1..d56db82 100644
--- a/lib/string.h
+++ b/lib/string.h
@@ -13,7 +13,7 @@
 /**
  * @brief Return the length of a string (excluding '\0').
  *
- * @param string
+ * @param string_value
  * @since v1.0.0
  */
 size_t string_get_length(const string_t string_value);
@@ -21,7 +21,7 @@ size_t string_get_length(const string_t string_value);
 /**
  * @brief Converts all the alphabetic characters in a string to uppercase.
  *
- * @param string
+ * @param string_value
  * @since v1.0.0
  */
 string_t string_to_uppercase(string_t string_value);
@@ -29,7 +29,7 @@ string_t string_to_uppercase(string_t string_value);
 /**
  * @brief Converts all the alphabetic characters in a string to lowercase.
  *
- * @param string
+ * @param string_value
  * @since v1.0.0
  */
 string_t string_to_lowercase(string_t string_value);
@@ -37,9 +37,9 @@ string_t string_to_lowercase(string_t string_value);
 /**
  * @brief Replace all the occurrences of search value into replace value in the string.
  *
- * @param string
- * @param search_value A character search value.
- * @param replace_value A character containing the text to replace for match.
+ * @param string_value
+ * @param search A character search value.
+ * @param replace A character containing the text to replace for match.
  * @since v1.0.0
  */
 string_t string_replace(string_t string_value, char search, char replace);
@@ -47,7 +47,7 @@ string_t string_replace(string_t string_value, char search, char replace);
 /**
  * @brief Removes all whitespace from the start of a string.
  *
- * @param string
+ * @param string_value
  * @since v1.0.0
  */
 string_t string_trim_start(string_t string_value);
@@ -55,7 +55,7 @@ string_t string_trim_start(string_t string_value);
 /**
  * @brief Removes all whitespace from the end of a string.
  *
- * @param string
+ * @param string_value
  * @since v1.0.0
  */
 string_t string_trim_end(string_t string_value);
@@ -63,7 +63,7 @@ string_t string_trim_end(string_t string_value);
 /**
  * @brief Removes all whitespace from the start and end of a string.
  *
- * @param string
+ * @param string_value
  * @since v1.0.0
  */
 string_t string_trim(string_t string_value);
@@ -71,7 +71,7 @@ string_t string_trim(string_t string_value);
 /**
  * @brief Return the copy of a string.
  *
- * @param string
+ * @param string_value
  * @since v1.0.0
  */
 string_t string_copy(const string_t string_value);
@@ -79,7 +79,7 @@ string_t string_copy(const string_t string_value);
 /**
  * @brief Capitalizes the string.
  *
- * @param string
+ * @param string_value
  * @since v1.0.0
  */
 string_t string_capitalize(string_t string_value);
@@ -87,7 +87,7 @@ string_t string_capitalize(string_t string_value);
 /**
  * @brief Returns the total number of occurrences of the given character in the string.
  *
- * @param string
+ * @param string_value
  * @param character
  * @since v1.0.0
  */
@@ -96,7 +96,7 @@ size_t string_total_occurrences_of_character(string_t string_value, char charact
 /**
  * @brief Reverse the characters in an array.
  *
- * @param string
+ * @param string_value
  * @since v1.0.0
  */
 string_t string_reverse(const string_t string_value);
@@ -114,7 +114,7 @@ bool string_equals(const string_t string1, const string_t string2);
 /**
  * @brief Check if the string is a integer.
  *
- * @param string
+ * @param string_value
  * @return true if the string is a integer, false otherwise.
  * @since v1.0.0
  */
@@ -123,8 +123,9 @@ bool string_get_is_integer(const string_t string_value);
 /**
  * @brief Split a string into substrings using the specified separator and return them as an array and update the pointer `result_size` to the resulting size of the created array.
  *
- * @param string
+ * @param string_value
  * @param separator
+ * @param result_size
  * @since v1.0.0
  */
 string_t* string_split(const string_t string_value, char separator, size_t* result_size);
@@ -134,6 +135,7 @@ string_t* string_split(const string_t string_value, char separator, size_t* resu
  *
  * @param array
  * @param separator
+ * @param array_length
  * @since v1.0.0
  */
 string_t string_join(string_t* array, const char separator, size_t array_length);
@@ -159,7 +161,7 @@ bool string_get_has_unique_characters(const string_t string);
 /**
  * @brief Returns the part of the string between the start and end indexes (both included).
  *
- * @param string
+ * @param string_value
  * @param index_start
  * @param index_end
  * @since v1.0.0
@@ -169,7 +171,7 @@ string_t string_substring(const string_t string_value, size_t index_start, size_
 /**
  * @brief Check if a string contains a substring.
  *
- * @param string
+ * @param string_value
  * @param substring
  * @return true if the string contains the substring, false otherwise.
  * @since v1.0.0
@@ -179,16 +181,20 @@ bool string_get_is_substring(const string_t string_value, const string_t substri
 /**
  * @brief Format a number to a string with specified separator.
  *
- * @param integer
- * @example string_get_formatted_number(1000, " ") // "1 000"
+ * @param number
+ * @param separator
  * @since v1.0.0
+ * @code
+ * string_get_formatted_number(1000, " ") // "1 000"
+ * string_get_formatted_number(1000, ",") // "1,000"
+ * @endcode
  */
 string_t string_get_formatted_number(const long long number, string_t separator);
 
 /**
  * @brief Returns a pointer to the last occurrence of character in the string.
  *
- * @param string
+ * @param string_value
  * @param character
  * @since v1.0.0
  */
@@ -197,7 +203,7 @@ string_t string_get_last_occurence_of_character(const string_t string_value, cha
 /**
  * @brief Check if a string starts with a substring.
  *
- * @param string
+ * @param string_value
  * @param prefix
  * @return true if the string starts with the substring, false otherwise.
  * @since v1.0.0
@@ -207,7 +213,7 @@ bool string_starts_with(const string_t string_value, const string_t prefix);
 /**
  * @brief Check if a string ends with a substring.
  *
- * @param string
+ * @param string_value
  * @param prefix
  * @return true if the string ends with the substring, false otherwise.
  * @since v1.0.0