public IActionResult Zavrsio(int id)
        {
            Dolasci d = _db.Dolasci.Find(id);

            DateTime sada = DateTime.Now;

            d.Odlazak   = sada;
            d.SatiRadio = sada.Subtract(d.Dolazak).Hours;

            _db.SaveChanges();
            return(RedirectToAction("List"));
        }