Revert "formatted all files."

This reverts commit 04250ebc98.

lib/utils/helpers/decodeBase64.dart

@@ -2,7 +2,7 @@ import 'dart:convert';
 
 String decodeBase64(String str) {
   //'-', '+' 62nd char of encoding,  '_', '/' 63rd char of encoding
-  var output = str.replaceAll('-', '+').replaceAll('_', '/');
+  String output = str.replaceAll('-', '+').replaceAll('_', '/');
   switch (output.length % 4) {
     // Pad with trailing '='
     case 0: // No pad chars in this case