boolean checkBeeperStack(int x, int y, int numBeepers) {
        for(int i=0; i < y; ++i){
            moveRobotForwards();
        }
        turnRobotRight();
        for(int i=0; i < x; ++i){
            moveRobotForwards();
        }

        if (countBeeperStack() == numBeepers){
            return true;
        }
        moveRobotBack();
        return false;
    }

    void turnRobotRight(){
        turnRobotLeft();
        turnRobotLeft();
        turnRobotLeft();
    }

    int countBeeperStack(){
        int counter = 0;
        while(isItemOnGroundAtRobot()){
            pickUpItemWithRobot();
            ++ counter;
        }
        return counter;
    }

    void moveRobotBack(){
        turnRobotLeft();
        turnRobotLeft();
        while(isSpaceInFrontOfRobotClear()){
            moveRobotForwards();
        }
       turnRobotLeft();
        while(isSpaceInFrontOfRobotClear()){
            moveRobotForwards();
        }
        turnRobotLeft();
        turnRobotLeft();
    }