function ob_filter_forum_name($authLink,$resultSet)
{
    $authLink = 'aaaa - '. $authLink;
    return $authLink;
}
add_filter( 'bbp_get_author_link', 'ob_filter_forum_name',10, 2);

return apply_filters( 'bbp_get_author_link', $author_link, $r );

add_filter( 'bbp_get_single_topic_description', '__return_false' );