internal Rental Edit(Rental updated)
{
var original = GetById(updated.Id);
updated.car = updated.car != null ? updated.car : original.car;
updated.description = updated.description != null ? updated.description : original.description;
updated.duration = updated.duration > 0 ? updated.duration : original.duration;
updated.miles = updated.miles > 0 ? updated.miles : original.miles;
updated.price = updated.price > 0 ? updated.price : original.price;
return(_repo.Edit(updated));
}