public Repository(List <RentContract> contracts, List <User> users, Park park)
{
Contracts = contracts ?? throw new ArgumentNullException(nameof(contracts));
Users = users ?? throw new ArgumentNullException(nameof(users));
Park = park ?? throw new ArgumentNullException(nameof(park));
}
static public Park GetPark()
{
Park park = new Park(new List <Car>(), new List <Inspection>());
return(park);
}