static void Main()
{
TankFactory tankFactory = new GermanTankFactory();
var tiger = tankFactory.CreateTank();
Console.WriteLine(tiger);
}
static void Main()
{
var germanFactory = new GermanTankFactory();
var russianFactory = new RussianTankFactory();
var americanFactory = new AmericanTankFactory();
var tigerTank = germanFactory.CreateTank();
var t34Tank = russianFactory.CreateTank();
var m1Abrams = americanFactory.CreateTank();
Console.WriteLine(tigerTank);
Console.WriteLine();
Console.WriteLine(t34Tank);
Console.WriteLine();
Console.WriteLine(m1Abrams);
}