def clean_meta_data(meta_data_frame):
    """
    Clean the meta data we have. Remove an unnamed column, rename some other columns, drop some columns
    :param meta_data_frame: pd dataframe
    :return: cleaned pd dataframe
    """
    meta = meta_data_frame.loc[:, ~meta_data_frame.columns.str.contains("^Unnamed")]
    meta = meta.rename(columns={"Country Code": "code", "Region": "region", "IncomeGroup": "income"})
    meta = meta.drop(columns=["SpecialNotes", "TableName"])
    return meta