def mix_string(s1: str, s2: str) -> str:
    """
    Given two strings s1 and s2, create a mixed string by alternating between str1 and str2 chars.

    #2

    mix_string("AAA", "bbb") -> AbAbAb
    mix_string("AA", "") -> AA
    mix_string("mxdsrn", "ie tig") -> mixed string
    """


if __name__ == '__main__':
    print(mix_string("AAA", "bbb"))  # "AbAbAb"