Apply dart format to all files

lib/utils/string_utils.dart

@@ -1,22 +1,21 @@
-
 class StringUtil {
   static bool isValidEmail(String email) {
     final regExp = RegExp(r'^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)*\.(\w+)$');
     return regExp.hasMatch(email);
   }
-  
+
   static String truncate(String text, int maxLength) {
     if (text.length <= maxLength) return text;
     return '${text.substring(0, maxLength)}...';
   }
-  
+
   static String formatDateTime(String dateTime) {
     try {
       final date = DateTime.parse(dateTime);
       return '${date.day}/${date.month}/${date.year} '
-             '${date.hour}:${date.minute.toString().padLeft(2, '0')}';
+          '${date.hour}:${date.minute.toString().padLeft(2, '0')}';
     } catch (e) {
       return dateTime;
     }
   }
-}
+}