[REFACTOR] [Hacker Rank] Warmup: Time Conversion solved ✅. Triying to fix sonarlint detected issues.

Author: Gonzalo Diaz

src/lib/exercises/src/hackerrank/warmup/time_conversion.c

@@ -51,12 +51,14 @@ char *HACKERRANK_WARMUP_timeConversion(const char *s) {
 
   char time_str[TIME_SIZE];
   strcpy(time_str, s);
-  const char *temp_time_str;
+  char *temp_time_str;
   unsigned long time_str_len = strlen(time_str);
   temp_time_str = HACKERRANK_WARMUP_getLast(time_str, time_str_len - 2);
   strcpy(time_str, temp_time_str);
+  free(temp_time_str);
   temp_time_str = HACKERRANK_WARMUP_getFirst(time_str, time_str_len - 2);
   strcpy(time_str, temp_time_str);
+  free(temp_time_str);
 
   char *endptr;
   long hour = strtol(hour_str, &endptr, 10);