Refactor code structure for improved readability and maintainability

src/file_handler.c

@@ -28,8 +28,10 @@ int loadListFromCSV(char *_filename, list_t *_list)
         }
         else
         {
-
-            exit(-1);
+            logErrorEvent(logger_global, "Error loading person from CSV: %s", buffer);
+            free(buffer);
+            fclose(f_in);
+            return 0;
         }
     }
     free(buffer);