reverse-string: fix indentation
reverse-string: fix indentation
exercism/xpython,jmluy/xpython,behrtam/xpython,N-Parsons/exercism-python,jmluy/xpython,exercism/python,smalley/python,exercism/xpython,N-Parsons/exercism-python,smalley/python,behrtam/xpython,exercism/python