'''
Implement a function void reverse(char* str) in C or C++ which reverses a null terminated string.

Hints: 410, 452
'''


def reverse_str(s):
    pass

if __name__ == '__main__':
    assert reverse_str('') ==
    assert reverse_str('') ==
    assert reverse_str('') ==
    assert reverse_str('') ==
    assert reverse_str('') ==
