format example

example/lib/const/resource.dart

@@ -1,6 +1,5 @@
 /// generate by resouce_generator library, shouldn't edit.
 class R {
-    
   /// ![preview](file:///Users/cai/Documents/GitHub/flutter_ijkplayer/./example/assets/sample1.mp4)
   static const String ASSETS_SAMPLE1_MP4 = "assets/sample1.mp4";
 }