#!/usr/bin/env runhaskell
main :: IO ()
main = do
  let a = splitOn ' ' "hoge fuga"
  case a of
    [] -> putStrLn "empty"
    x:xs -> putStrLn x

splitOn :: Char -> String -> [String]
splitOn splitter string =
  case string of
    [] -> []
    x:xs ->
      if x == splitter then
        [" ", xs]
      else
        [[x]] (splitOn splitter xs)