function prepareKeyword($keyword) {
    $keyword  = html_entity_decode($keyword);
    $keyword  = html_entity_decode($keyword);
    $keyword  = html_entity_decode($keyword);
    $keyword  = iconv("ISO-8859-1", "UTF-8", $keyword);
    $keyword  = cleanString($keyword);
    $keyword  = html_entity_decode($keyword);
    if ($keyword != "") {
        $keyword = mb_strtolower($keyword, "UTF-8");
        $keyword = htmlentities($keyword, ENT_HTML5);
    }
    return $keyword;
}