WOOCOMMERCE CUSTOM CATEGORY WITH SHORTCODE

// Shortcode For AUCTION [all-categories]
add_shortcode('all-categories', 'cf_woo_all_categories');
function cf_woo_all_categories()
{
   ob_start(); ?>

<h3 class="headd">All Categories </h3>
<div id="owl-demo" class="all-cat categories-boxes">
               
       <?php
$cat_args = array(
   'hide_empty' => true,
);
$product_categories = get_terms( 'product_cat', $cat_args );
foreach ($product_categories as $key => $category) {
$thumbnail_id = get_term_meta( $category->term_id, 'thumbnail_id', true );
$image = wp_get_attachment_url( $thumbnail_id ); ?>
            <div class="item" style="background:url( <?php echo $image ?> ) no-repeat center center / cover ">
               <div class="content">
                   <div class="readmore">
                    <a href="<?php echo get_term_link($category) ?>"><?php  echo $category->name; ?></a>
                   </div>
               </div>
            </div>
  <?php
}
   ?>
   
   </div> <!-- owl-demo -->
<!-- structucre past hese -->
<?php
wp_reset_postdata();
   return '' . ob_get_clean();
}