Remove post_type slug from post URL

<?php
// remove cpt slug from permalinks
function remove_cpt_slug( $post_link, $post, $leavename ) {

    if ( $post->post_type != 'products' ) {
        return $post_link;
    } else {
        $post_link = str_replace( '/' . $post->post_type . '/', '/', $post_link );
        return $post_link;
    }
}
add_filter( 'post_type_link', 'remove_cpt_slug', 10, 3 );

//Remvove slug
function parse_request_remove_cpt_slug( $query ) {

    if ( ! $query->is_main_query() || 2 != count( $query->query ) || ! isset( $query->query['page'] ) ) {
        return;
    }

    if ( ! empty( $query->query['name'] ) ) {
        global $wpdb;
        $cpt = $wpdb->get_var("SELECT post_type FROM $wpdb->posts WHERE post_name = '{$query->query['name']}'");

        // Add CPT to the list of post types WP will include when it queries based on the post name.
        $query->set( 'post_type', $cpt );
    }
}
add_action( 'pre_get_posts', 'parse_request_remove_cpt_slug' );

//Add rewrite rule
function rewrite_rule_remove_cpt_slug() {

    add_rewrite_rule(
        '(.?.+?)(?:/([0-9]+))?/?$',
        'index.php?custom_post_type=$matches[1]/$matches[2]&post_type=custom_post_type',
        'bottom'
    );
}
add_action( 'init', 'rewrite_rule_remove_cpt_slug', 1, 1 );