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| Given a string, return a new string where "not " has been added to the front. However, if the string already begins with "not", return the string unchanged. not_string('candy') → 'not candy' not_string('x') → 'not x' not_string('not bad') → 'not bad' ...Save, Compile, Run (ctrl-enter) | 
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Difficulty: 127.0
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