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

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;
+}