Add to compare Button

<?php if(function_exists('yith_woocompare_constructor')) : ?>
<!-- Add to compare Button -->
<a class="compare" data-product_id="<?php echo get_the_ID(); ?>" href="<?php echo site_url(); ?>/?action=yith-woocompare-add-product&amp;id=<?php echo get_the_ID(); ?>"></a>
<?php endif; ?>