public void InsertDebitCard()
 {
     atmMachineState.InsertDebitCard();
     // Debit csrd has been inserted so internal state of ATM Machine
     // Has been changed to 'DebitCardNotInserted'
     if (atmMachineState is DebitCardNotInsertedState)
     {
         atmMachineState = new DebitCardInsertedState();
         Console.WriteLine($"ATM machine internal state has been moved to : {atmMachineState.GetType().Name}");
     }
 }
        public void EjectDebitCard()
        {
            atmMachineState.EjectDebitCard();
            // Debit Card has been ejected so internal state of ATM Machine
            // has been changed to 'DebitCardNotInsertedState'

            if (atmMachineState is DebitCardInsertedState)
            {
                atmMachineState = new DebitCardNotInsertedState();
                Console.WriteLine("ATM Machine internal state has been moved to : "
                                  + atmMachineState.GetType().Name);
            }
        }