public static Car createCar(String carType){
        if (carType.equals("RacecarI")){
            return new RacecarI(60,"black", (int) (Math.random() * 5) );
        }

        else if (carType.equals("RacecarII")){
            return new RacecarII(60,"black", (int) Math.random() * 5 );
        }

        else return  null;
    }