feat(solutions): add look-and-say-sequence-conway/c/function

challenges/look-and-say-sequence-conway/solutions/c/function/README.md

@@ -0,0 +1,3 @@
+# look-and-say-sequence-conway/c/function
+
+Created by [@Divlo](https://github.com/Divlo) on 30 November 2021.

challenges/look-and-say-sequence-conway/solutions/c/function/character.c

@@ -0,0 +1,17 @@
+#include "character.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+void character_append(char* string, char character) {
+  size_t length = strlen(string);
+  string[length] = character;
+  string[length + 1] = '\0';
+}
+
+void character_append_many(char* string, char* characters) {
+  size_t characters_length = strlen(characters);
+  for (size_t index = 0; index < characters_length; index++) {
+    character_append(string, characters[index]);
+  }
+}

challenges/look-and-say-sequence-conway/solutions/c/function/character.h

@@ -0,0 +1,22 @@
+#ifndef __CHARACTER__
+#define __CHARACTER__
+
+/**
+ * @brief Append a character to a string, assuming string points to an array
+ * with enough space.
+ *
+ * @param string
+ * @param character
+ */
+void character_append(char* string, char character);
+
+/**
+ * @brief Append many characters to a string, assuming string points to an array
+ * with enough space.
+ *
+ * @param string
+ * @param characters
+ */
+void character_append_many(char* string, char* characters);
+
+#endif

challenges/look-and-say-sequence-conway/solutions/c/function/input.c

@@ -0,0 +1,19 @@
+#include "input.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "character.h"
+
+char* input() {
+  char character;
+  size_t length = 1;
+  char* string = malloc(length * sizeof(char));
+  *string = '\0';
+  while ((character = getchar()) != '\n' && character != EOF) {
+    length++;
+    string = realloc(string, length * sizeof(char));
+    character_append(string, character);
+  }
+  return string;
+}

challenges/look-and-say-sequence-conway/solutions/c/function/input.h

@@ -0,0 +1,11 @@
+#ifndef __INPUT__
+#define __INPUT__
+
+/**
+ * @brief Read a line from stdin.
+ *
+ * @return char*
+ */
+char* input();
+
+#endif

challenges/look-and-say-sequence-conway/solutions/c/function/solution.c

@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "character.h"
+#include "input.h"
+
+int main() {
+  char* string = input();
+  size_t string_length = strlen(string);
+  char* result = malloc(sizeof(char*) * (string_length + 1));
+  for (size_t index = 0; index < string_length; index++) {
+    size_t number_of_appearances = 0;
+    char value_to_search = string[index];
+    size_t iteration = index;
+    while (iteration < string_length && string[iteration] == value_to_search) {
+      number_of_appearances++;
+      iteration++;
+    }
+    char* number_of_appearances_string = malloc(sizeof(char*) * (string_length + 1));
+    snprintf(number_of_appearances_string, sizeof(result), "%zu", number_of_appearances);
+    character_append_many(result, number_of_appearances_string);
+    character_append(result, value_to_search);
+    index += number_of_appearances - 1;
+  }
+  printf("%s\n", result);
+  return EXIT_SUCCESS;
+}

challenges/look-and-say-sequence-conway/solutions/cs/function/Solution.cs

@@ -18,7 +18,7 @@ namespace Solution
                     numberOfAppearances += 1;
                     iteration++;
                 }
-                result = result + numberOfAppearances.ToString() + line[index];
+                result = result + numberOfAppearances.ToString() + valueToSearch;
                 index += numberOfAppearances - 1;
             }
             Console.WriteLine(result);