def format_list_entry(str_list: list) -> str:
    """
    Converts list of strings into a single string with values separated by comma.
    :param list str_list: list of strings
    :return: formatted string
    """
    out_str = ''
    for elm in str_list:
        out_str += elm
        out_str += ', '
    return out_str[:-2]