Bounce subcat to parent

add_action( 'pre_get_posts', 'bounce_subcat_to_parent' );
function bounce_subcat_to_parent( $query ) {
    if ( is_admin() ) {
        return;
    }
    if ( $query->is_main_query() && $query->is_category ) {
        $cat = get_queried_object();
        //var_dump($cat);
        //exit;
        if ( 0 != $cat->category_parent ) {
            $link = get_category_link( $cat->category_parent );
            $link = str_replace( 'category/', '', $link );
        var_dump($link);
        exit;
            wp_safe_redirect( $link );
        }
    }
}

add_action( 'template_redirect', 'bounce_special_post_to_cat' );
function bounce_special_post_to_cat(  ) {
    global $wpdb, $wp_query;

    // Guess the current post_type based on the query vars.
    if ( get_query_var('post_type') )
        $post_type = get_query_var('post_type');
    else if ( !empty($wp_query->query_vars['pagename']) )
        $post_type = 'page';
    else
        $post_type = 'post';

    if ( is_singular() && 'post' == $post_type ) {
        global $post;
        $cats = wp_get_object_terms($post->ID, array( 'category'), $args = array( 'fields' => 'all' ) );
        //error_log( var_export( $cats, 1 ));
        foreach( $cats as $cat ) {
            // check for meta data flag
            $flat = get_terms_meta( $cat->term_id, 'flatcategory', true );
            if ( 'checked' == $flat ) {
                $link = get_category_link( $cat->term_id );
                wp_safe_redirect( $link );
                exit();
            }
        }
    }

}