def clean_entry_id(entryid):
    """
    Clean up entry ID.

    :param entryid: Entry ID.
    :type entryid: str
    """
    entryid = str(entryid).lower()
    if entryid is None:
        print('NO SCP SPECIFIED')
        raise SystemExit
    elif not entryid.startswith(('scp-', 'spc-')):
        entryid = 'scp-' + entryid
    return entryid
