def format_author_ed(citation_elements):
    """Standardise to (ed.) and (eds.)

    e.g. Remove extra space in (ed. )
    """
    for el in citation_elements:
        if el['type'] == 'AUTH':
            el['auth_txt'] = el['auth_txt'].replace('(ed. )', '(ed.)')
            el['auth_txt'] = el['auth_txt'].replace('(eds. )', '(eds.)')
    return citation_elements