private void OnTriggerEnter2D(Collider2D collider)
    {
        GameObject laser = collider.gameObject;

        if (laser.GetComponent <bulletController>() != null)
        {
            sceneCon.AddScore(20);
            Destroy(laser.gameObject);
            Destroy(gameObject);
        }
    }
    private void OnTriggerEnter2D(Collider2D collider)
    {
        GameObject laser = collider.gameObject;

        if (laser.GetComponent <bulletController>() != null)
        {
            Instantiate(smallAsteroidPrefab, transform.position, Quaternion.identity, sceneCon.transform);
            Instantiate(smallAsteroidPrefab, transform.position, Quaternion.identity, sceneCon.transform);
            sceneCon.AddScore(15);
            Destroy(laser.gameObject);
            Destroy(gameObject);
        }
    }