static void Main(string[] args)
{
var serviceCollection = new ServiceCollection();
serviceCollection.AddScoped <IPetRepository, PetRepository>();
serviceCollection.AddScoped <IPetService, PetService>();
serviceCollection.AddScoped <IPrinter, Printer>();
var serviceProvider = serviceCollection.BuildServiceProvider();
var printer = serviceProvider.GetRequiredService <IPrinter>();
printer.startUI();
FakeDb.InitialisePetData();
}