Simulate a perfect suffle of a deck of cards.
A perfect shuffle of a deck of card is splitting a deck of cards into equal halves, and perfectly interleaving them.
Perfectly shuffling [1, 2, 3, 4, 5, 6] gives [1, 4, 2, 5, 3, 6].
(We consider that a deck of cards has an even number of cards.)
You'll expose a perfect_shuffle(deck) function, perfectly shuffling
the given iterable.
Did you know that if you shuffle 10 times a deck of 1024 cards, the deck returns to its initial state ? It's probably a good way to test your implementation.
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