void OnTriggerEnter(Collider other)
 {
     if (isTouching(other))
     {
         Destroy(gameObject);
         LivesScript.LostLife();
     }
 }
 void Update()
 {
     transform.position = new Vector3(transform.position.x, transform.position.y, transform.position.z - BallSpeed);
     if (gameObject.transform.position.z < -0.8)
     {
         Destroy(gameObject);
         LivesScript.LostLife();
     }
 }