anchor.diff:    String counter;
     Stopwatch watch = new Stopwatch();
     Timer timer;
  -  List<String> times;
  +  List<Period> periods;
   
     ClockState currentState;
   
  
positive.code: enum ClockState{
    pomodoro,
    rest
  }
  
  @Component(selector: 'clock')
  
negative.code:   bool isPomotime(){
      return currentState == ClockState.pomodoro;
    }
  }
  