public static void Main()
{
var p = new MyPerson();
p.Name = "test";
p.AddPhonenumber("555-2356");
Console.WriteLine(string.Join(", ", p.Phonenumber));
var c = new MyContact();
c.Name = "contact";
c.AddPhonenumber("222-235");
Console.WriteLine(string.Join(", ", c.Phonenumber));
}
