static void Main(string[] args)
{
var serviceCollection = new ServiceCollection();
serviceCollection.AddScoped <IPetShopRepository, PetShopRepository>();
serviceCollection.AddScoped <IPetShopService, PetShopService>();
var serviceProvider = serviceCollection.BuildServiceProvider();
var petShopService = serviceProvider.GetRequiredService <IPetShopService>();
var UI = new PetShopUI(petShopService);
FakeDB.InitOwnerData();
FakeDB.InitPetData();
UI.StartUI();
}