getting free sample products

free-sample-product-title.php

add_filter('rnoc_get_cart_line_item_details', 'rnoc_get_cart_line_item_details', 10, 5);
function rnoc_get_cart_line_item_details($item_array, $cart, $item_key, $item, $item_details)
{
    if ($item_array['title'] == "Free Sample" && isset($item_details['free_sample']) && !empty($item_details['free_sample'])) {
        $product = wc_get_product($item_details["free_sample"]);
        $name = $item_array['title'] . " (" . $product->get_name() . ")";
        $item_array['title'] = $name;
    }
    return $item_array;
}