Append post ID at the end of the URL for a custom post type

Append post ID at the end of the URL for a custom post type.php

<?php

function change_post_type_link( $link, $post = 0 ){
    if ( $post->post_type == 'product' ){
        return home_url( 'product/'. $post->post_name .'/'. $post->ID );
    } else {
        return $link;
    }
}

add_filter('post_type_link', 'change_post_type_link', 10, 2);

add_action( 'init', 'change_rewrites_init' );

function change_rewrites_init(){
    add_rewrite_rule(
        'product/([a-z-]+)/([0-9]+)?$',
        'index.php?post_type=product&p=$matches[1]&postid=$matches[2]',
        'top' );
}