Unfortunately it's not possible at all to transfer Amazon Gift Card money to your debit card.
So if you have an Amazon Gift Card you will either need to use the Amazon Gift Card on Amazon to purchase something or if you don't want the Amazon Gift Card but you want cash instead then you can sell your Amazon Gift Card to websites such as CardCash and they'll either send you money through Paypal or send you a check for the amount on your Amazon or other gift cards.