Haskell
import Data.List diamond :: Int -> Maybe String diamond n | even n || n < 0 = Nothing | otherwise = Just diamondLines where makeLine k = replicate (div (n - k) 2) ' ' ++ replicate k '*' diamondLines = unlines $ map makeLine ([1, 3 .. n] ++ [n - 2, n - 4 .. 1])
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Haskell