Format all multitests

tests/language_strong/substring_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Dart version of two-argument Ackermann-Peter function.
 
 import "package:expect/expect.dart";
 
-
 main() {
   try {
     print("abcdef".substring(1.5, 3.5)); //   //# 01: static type warning
     Expect.fail("Should have thrown an exception"); // //# 01: continued
   } on TypeError catch (e) {
     // OK.
   } on ArgumentError catch (e) {
     // OK.
   }
 }