woocommerce add long description to products on shop page with character limit

1/**
2 * WooCommerce, Add Long Description to Products on Shop Page with Character limit
3 *
4 * @link https://wpbeaches.com/woocommerce-add-short-or-long-description-to-products-on-shop-page
5 */
6add_action( 'woocommerce_after_shop_loop_item_title', 'wc_add_long_description' , 9);
7function wc_add_long_description() {
8  global $product;
9
10  ?>
11        <div itemprop="description">
12            <?php echo substr( apply_filters( 'the_content', $product->post->post_content ), 0,77 ); echo '...' ?>
13        </div>
14  <?php
15}