void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.tag == "ThrowableObject"&&collision.transform.position.z>=transform.position.z)
        {
            levelController.money += earning;
            objectivesOnLevel--;
            if(objectivesOnLevel==0)
            {
                levelController.level++;
            }
            else if(objectivesOnLevel>5)
            {
                Objective objective = Instantiate(this);
                objective.transform.position = transform.position;

            }
        }
    }