anchor.diff:  
   class Clock{
   
  -  int startPomodoroAt, startRestAt;
  +  int startPomodoroAt, startRestAt, currentDuration;
     String durationRest, durationPomodoro;
     String counter;
     Stopwatch watch = new Stopwatch();
  
positive.code:   
    void reset() {
      watch.reset();
      counter = prettyPrintTime(startPomodoroAt);
    }
  
    void updateTime(Timer _) {
  
negative.code:     durationPomodoro = prettyPrintTime(startPomodoroAt);
      counter= prettyPrintTime(25*60);
      currentState = ClockState.pomodoro;
      currentDuration = startPomodoroAt;
    }
    
    void start() {
  