def build_menu(buttons: [],
               n_cols: int,
               header_buttons: [] = None,
               footer_buttons: [] = None):
    menu = [buttons[i:i + n_cols] for i in range(0, len(buttons), n_cols)]
    if header_buttons:
        menu.insert(0, [header_buttons])
    if footer_buttons:
        menu.append([footer_buttons])
    return menu