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Snake nextWorld and step
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import Helper
--right :: Direction
--collides :: Snake -> Coordinate -> Bool
--width :: Int
--height :: Int
--inBox :: Coordinate -> Bool
--extend :: Snake -> Direction -> Snake
--move :: Snake -> Direction -> Snake
--nextApple :: Apple -> Apple
--collidesApple :: Snake -> Apple -> Apple
--initialPosition :: Snake
nextWorld :: World -> World
nextWorld = undefined
step :: Float -> World -> World
step = undefined