def METHOD_NAME() -> None:
    n = NamingConvention()
    assert n.normalize_identifier("id") == "__id"
    assert n.normalize_identifier("_id") == "___id"
    assert n.normalize_identifier("__id") == "__id"
    assert n.normalize_identifier("___id") == "___id"
    assert n.normalize_identifier("_additional") == "__additional"
    assert n.normalize_identifier("__additional") == "__additional"