Adding WooCommerce cart link to wp_nav_menu()

functions.php

<?php

function my_nav_wrap() {
    $wrap  = '<ul id="%1$s" class="%2$s">';
    $wrap .= '%3$s';
    $wrap .= '<li class="cart">';
    $wrap .= '<a href="' . WC()->cart->get_cart_url() . '"> class="cart_totals">';
    $wrap .= WC()->cart->get_cart_total();
    $wrap .= '</a>';
    $wrap .= '</li>';
    $wrap .= '</ul>';

  return $wrap;
}

index.php

<nav>
  <?php wp_nav_menu(array(
    'theme_location' => 'my_menu_location',
    'items_wrap' => my_nav_wrap()
  )); ?>
</nav>

Hi,

This doesn't work. It prints out > class="cart_totals">

$wrap .= ' class="cart_totals">';

Updated:-

$wrap .= '';