我试图通过在主题函数functions.php中添加以下代码来删除该代码，但是它不起作用。

    function remove_shipping_calc_on_cart( $show_shipping ) {
    if( is_cart() ) {
        return false;
    }
    return $show_shipping;
}
add_filter( 'woocommerce_cart_ready_to_calc_shipping','remove_shipping_calc_on_cart',99 );

然后我尝试编辑cart-totals.php文件，但无法执行。你能帮我做到吗？

cart-totals.php文件争用的代码如下：

/**
 * Cart totals
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/cart/cart-totals.php.
 *
 * HOWEVER,on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible,but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see         https://docs.woocommerce.com/document/template-structure/
 * @author      WooThemes
 * @package     WooCommerce/Templates
 * @version     2.3.6
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

?>

<div class="cart_totals <?php if ( WC()->customer->has_calculated_shipping() ) echo 'calculated_shipping'; ?>">

    <div class="content-block-title"><?php _e( 'Cart totals','woocommerce' ); ?></div>

    <div class="content-block bg-white block-shadow">
        <div class="content-block-inner pb-0">

            <?php do_action( 'woocommerce_before_cart_totals' ); ?>

            <table cellspacing="0" class="list-table">

                <tr class="cart-subtotal">
                    <th><?php _e( 'Subtotal','woocommerce' ); ?></th>
                    <td data-title="<?php esc_attr_e( 'Subtotal','woocommerce' ); ?>"><?php wc_cart_totals_subtotal_html(); ?></td>
                </tr>

                <?php foreach ( WC()->cart->get_coupons() as $code => $coupon ) : ?>
                    <tr class="cart-discount coupon-<?php echo esc_attr( sanitize_title( $code ) ); ?>">
                        <th><?php wc_cart_totals_coupon_label( $coupon ); ?></th>
                        <td data-title="<?php echo esc_attr( wc_cart_totals_coupon_label( $coupon,false ) ); ?>"><?php wc_cart_totals_coupon_html( $coupon ); ?></td>
                    </tr>
                <?php endforeach; ?>

                <?php if ( WC()->cart->needs_shipping() && WC()->cart->show_shipping() ) : ?>

                    <?php do_action( 'woocommerce_cart_totals_before_shipping' ); ?>

                    <?php wc_cart_totals_shipping_html(); ?>

                    <?php do_action( 'woocommerce_cart_totals_after_shipping' ); ?>

                <?php elseif ( WC()->cart->needs_shipping() && 'yes' === get_option( 'woocommerce_enable_shipping_calc' ) ) : ?>

                    <tr class="shipping">
                        <th>حمل و نقل</th>
                        <td data-title="حمل و نقل"><?php woocommerce_shipping_calculator(); ?></td>
                    </tr>

                <?php endif; ?>

                <?php foreach ( WC()->cart->get_fees() as $fee ) : ?>
                    <tr class="fee">
                        <th><?php echo esc_html( $fee->name ); ?></th>
                        <td data-title="<?php echo esc_attr( $fee->name ); ?>"><?php wc_cart_totals_fee_html( $fee ); ?></td>
                    </tr>
                <?php endforeach; ?>

                <?php if ( wc_tax_enabled() && 'excl' === WC()->cart->tax_display_cart ) :
                    $taxable_address = WC()->customer->get_taxable_address();
                    $estimated_text  = WC()->customer->is_customer_outside_base() && ! WC()->customer->has_calculated_shipping()
                            ? sprintf( ' <small>' . __( '(estimated for %s)','woocommerce' ) . '</small>',WC()->countries->estimated_for_prefix( $taxable_address[0] ) . WC()->countries->countries[ $taxable_address[0] ] )
                            : '';

                    if ( 'itemized' === get_option( 'woocommerce_tax_total_display' ) ) : ?>
                        <?php foreach ( WC()->cart->get_tax_totals() as $code => $tax ) : ?>
                            <tr class="tax-rate tax-rate-<?php echo sanitize_title( $code ); ?>">
                                <th><?php echo esc_html( $tax->label ) . $estimated_text; ?></th>
                                <td data-title="<?php echo esc_attr( $tax->label ); ?>"><?php echo wp_kses_post( $tax->formatted_amount ); ?></td>
                            </tr>
                        <?php endforeach; ?>
                    <?php else : ?>
                        <tr class="tax-total">
                            <th><?php echo esc_html( WC()->countries->tax_or_vat() ) . $estimated_text; ?></th>
                            <td data-title="<?php echo esc_attr( WC()->countries->tax_or_vat() ); ?>"><?php wc_cart_totals_taxes_total_html(); ?></td>
                        </tr>
                    <?php endif; ?>
                <?php endif; ?>

                <?php do_action( 'woocommerce_cart_totals_before_order_total' ); ?>

                <tr class="order-total">
                    <th><?php _e( 'Total','woocommerce' ); ?></th>
                    <td style="font-size: 18px;text-align: center;color: #4eb051;" data-title="<?php esc_attr_e( 'Total','woocommerce' ); ?>"><?php wc_cart_totals_order_total_html(); ?></td>
                </tr>

                <?php do_action( 'woocommerce_cart_totals_after_order_total' ); ?>

            </table>

            <?php do_action( 'woocommerce_after_cart_totals' ); ?>

        </div>
    </div>

</div>

我如何编辑这些代码以从Woocommerce购物车中删除“删除运送”？