def find_write_contribs() -> None:
    map_file_auth = {}
    for filename in scantree('cltk'):
        filepath = filename.path
        authors_list = get_authors(filepath)
        if authors_list:
            map_file_auth[filepath] = authors_list
    map_auth_file = defaultdict(list)
    for file, authors_file in map_file_auth.items():
        for author in authors_file:
            map_auth_file[author].append(file)
    map_auth_file = sort_def_dict(map_auth_file)
    map_auth_file_sorted = sorted(map_auth_file.items())
    map_auth_file = OrderedDict(map_auth_file_sorted)
    write_contribs(map_auth_file)