You need to add return string as your final statement so it knows what to return, otherwise nothing is returned - hence "None" (the default value) is returned. Returning a value means that the value is modified and can be used to check for equality.
return string
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You need to add
return stringas your final statement so it knows what to return, otherwise nothing is returned - hence "None" (the default value) is returned. Returning a value means that the value is modified and can be used to check for equality.