# File lib/quiz1/t/solutions/Bill Guindon/solitaire.rb, line 162
  def shift_card(name, suit, count)
    # find the card
    idx = @deck.find_card(name, suit)
    # remove it from the deck.
    card = @deck.cards.slice!(idx)
    # calculate new placement.
    idx += count
    # the slice above makes length 'look' zero-based
    idx -= @deck.cards.length if idx > @deck.cards.length

    # glue the deck together as cards before, card, cards after.
    @deck.cards = @deck.cards[0...idx] + [card] +
@deck.cards[idx...@deck.cards.length]
  end