Source code for kyu_5.first_non_repeating_character.first_non_repeating_letter

#  Created by Egor Kostan.
#  GitHub: https://github.com/ikostan
#  LinkedIn: https://www.linkedin.com/in/egor-kostan/


def first_non_repeating_letter(string: str) -> str:
    """
    A function named first_non_repeating_letter that
    takes a string input, and returns the first
    character that is not repeated anywhere in the string.
    :param string:
    :return:
    """
    result = ''
    string_lower = string.lower()

    for i, s in enumerate(string_lower):
        if string_lower.count(s) == 1:
            return string[i]

    return result