[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

@@ -48,6 +48,11 @@ char *HACKERRANK_WARMUP_timeConversion(const char *s) {
   char *hour_str = HACKERRANK_WARMUP_getFirst(s, 2);
 
   char *time_str = malloc(strlen(s) + 1);
+  if (time_str == NULL) {
+    free(meridian);
+    free(hour_str);
+    return NULL;
+  }
 
   strcpy(time_str, s);
   char *temp_time_str;
@@ -68,7 +73,6 @@ char *HACKERRANK_WARMUP_timeConversion(const char *s) {
     free(meridian);
     free(hour_str);
     free(time_str);
-    free(endptr);
     return NULL;
   } else {
     printf("The integer value is: %ld\n", hour);
@@ -85,8 +89,8 @@ char *HACKERRANK_WARMUP_timeConversion(const char *s) {
   char *conversion = malloc(BUFFER_MAX_SIZE * sizeof(char));
 
   snprintf(conversion, BUFFER_MAX_SIZE, "%02ld%s", hour, time_str);
-  free(hour_str);
   free(meridian);
+  free(hour_str);
   free(time_str);
 
   return conversion;