Aryadev Chavali
76a7017246
Given n in 0..51, certainly there exists r, s s.t. `n = 13s + r` where r in 0..12 and s in 0..3. `r` is the rank, and `s` is the suit. ranks are ordered Ace, 2, 3, ..., Queen, King and suits are ordered Diamond, Club, Heart, Spade. Therefore there is a 1-1 correspondence between 0..51 and any card in the deck. Jokers are a bit less straightforward; for now I'll define them as an outlier which doesn't exist in the same bounds (which is why they're the default return for suit in int->suit). Likely I'll go for -1 representing a Joker.
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