static void Main(string[] args)
{
var client = new Author();
client.Nume = "Maria";
client.Email = "*****@*****.**";
client.Country = "Ro";
var carte = new Book();
carte.Nume = "Prima carte";
carte.Year = 1999;
carte.Price = 200;
carte.Author = client;
Console.WriteLine(client.AllDetails);
client.Print();
}
public void Print()
{
Console.WriteLine($"Book={this.Nume}- Year={this.Year} Price={this.Price}");
Author.Print();
Console.WriteLine();
}