anchor.diff:      _updateTimer.cancel();
     }
     
  -  void update() {
  +  void update([int place = 1]) {
       if (_isStart) {
         var msg = "(${_watch.elapsed.inSeconds}s)";
         _lastMsg = msg;
  
positive.code:   
    TimeDisplay();
    
    void start() {
      stdin.echoMode = false;
      _watch = new Stopwatch();
      _updateTimer = new Timer.periodic(new Duration(milliseconds: 50), (timer) {
        update();
      });
      _watch.start();
    }
  
negative.code:       _isStart = false;
      } else {
        Console.moveCursorBack(_lastMsg.length);
        var msg = "(${(_watch.elapsed.inMilliseconds / 1000).toStringAsFixed(place)}s)";
        _lastMsg = msg;
        Console.setBold(true);
        Console.write(msg);
  