Source code for kyu_6.first_character_that_repeats.first_character_that_repeats

"""
Solution for -> First character that repeats.

Created by Egor Kostan.
GitHub: https://github.com/ikostan
"""




def first_dup(word: str) -> str | None:
    """
    Find the first character that repeats in a String and return that character.

    :param word: string
    :return: string, None
    """
    for char in word:
        if word.count(char) > 1:
            return char
    return None