Rename Price of Free Products

/**
 * Snippet Name:     Rename price of free products
 * Snippet Author:   coding-bunny.com
 * Description:      Displays "Free" for products with a price of zero or empty.
 */

add_filter( 'woocommerce_get_price_html', 'cb_rename_free_product_price', 10, 2 );

/**
 * Rename the price display for products that are free.
 *
 * @param string $price   The price HTML.
 * @param WC_Product $product The product object.
 * @return string Modified price HTML.
 */
function cb_rename_free_product_price( string $price, WC_Product $product ): string {
    // Check if the product price is empty or zero
    if ( empty( $product->get_price() ) || $product->get_price() == 0 ) {
        // Set the price display to "Free"
        $price = __( 'Free', 'woocommerce' );
    }
    return $price;
}