This code works for a car directory. It adds car details(owner's name, surname, car id, car model,regsitration date and service date of the car). It can be used to delete cars from directory. It list the available cars in the directory. It can be used to search for cars in the directory(search according to car id, search according to owner's name). It can update the car information already saved. It can sort the cars in the directory (according to car id, according to owner's name)