anchor.diff:      if (_players.containsKey(id)) {
         return _players[id];
       } else {
  -      final player = AssetsAudioPlayer._(id: id);
  +      final player = AssetsAudioPlayer._(
  +        id: id,
  +      );
         _players[id] = player;
         return player;
       }
  
positive.code: 
    final String id;
  
    AssetsAudioPlayer._({this.audioPlayerHandler, this.id = _DEFAULT_PLAYER}) {
      _init();
    }
  
  
negative.code: 
    factory AssetsAudioPlayer.newPlayer() => _getOrCreate(id: uuid.v4());
  
    AudioPlayerHandler audioPlayerHandler;
  
    /// empty constructor now create a new player
    factory AssetsAudioPlayer() => AssetsAudioPlayer.newPlayer();
  