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
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