# File lib/quiz1/t/solutions/Moses Hohman/deck.rb, line 22
                def move_card!(card, offset)
                        current_index = @order.index(card.code)
                        new_index = current_index+offset
                        if new_index >= NUM_CARDS
                                new_index -= NUM_CARDS - 1
                        elsif new_index < 0
                                new_index += NUM_CARDS - 1
                        end
                        @order.delete_at(current_index)
                        @order.insert(new_index, card.code)
                end