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

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]);
+  }
+}