private IEnumerator OnTriggerEnter2D(Collider2D collision)
    {
        TimeBehaviour timeBehaviour = collision.GetComponent <TimeBehaviour>();

        gameObject.GetComponent <AudioSource>().Play();

        if (collision.gameObject.tag == "Player" && timeBehaviour != null)
        {
            timeBehaviour.AddTime();    //adds five seconds to the time
        }
        gameObject.GetComponent <SpriteRenderer>().enabled = false;
        yield return(new WaitForSeconds(0.4f));

        Destroy(gameObject);
    }