static void doWork()
{
Console.WriteLine($"Journey by Airplane");
Airplane myplane = new Airplane();
myplane.StartEngine("Contact");
myplane.TakeOff();
myplane.Drive();
myplane.Land();
myplane.StopEngine("whiiirrr");
Console.WriteLine($"journey by Car");
Car mycar = new Car();
mycar.StartEngine("BRRRRMMMMM");
mycar.Accelerate();
mycar.Drive();
mycar.brake();
mycar.StopEngine("phut phut");
Console.WriteLine("\nTesting Polymorphism");
Vehicle v = mycar;
v.Drive();
v = myplane;
v.Drive();
}