Question: 3. Use recursion on lists to write a Haskell function whisper such that whisper str returns the string obtained by converting all up percase letters

3. Use recursion on lists to write a Haskell function whisper

3. Use recursion on lists to write a Haskell function whisper such that whisper str returns the string obtained by converting all up percase letters to their lowercase equivalents; all other characters are left unchanged. For example, your function should have the following behavior: *Main> whisper "One, two THREE, Four!" "one, two. three, four

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