anchor.diff:      int floor = int.parse(req.uri.queryParameters['atFloor']);
       Direction direction = req.uri.queryParameters['to'] == 'UP' ? Direction.UP : Direction.DOWN;
       _calls.add(new Call(floor, direction));
  -    _stack.add("Call at floor ${floor} direction ${direction}");
       _writeResponse(req);
  +    _stack.add("(${new DateTime.now().difference(start).inMilliseconds}ms) Call at floor ${floor} direction ${direction}");
     }
     
     lastResetHandler(HttpRequest req) {
  
positive.code:   
    HttpServer.bind('0.0.0.0', port).then(((HttpServer server) {
      var router = new Router(server)
      ..filter(matchAny(allUrls), log)
      ..serve(resetUrl, method: 'GET').listen(building.resetHandler)
      ..serve(nextCommandUrl, method: 'GET').listen(building.nextCommandHandler)
      ..serve(goUrl, method: 'GET').listen(building.goHandler)
  
negative.code:   
  }
  
  
  
  /**
  