Get cart total inside an html tag in Woocommerce

Question

I'm trying to add a custom menu element to the WordPress navigation. I'm using Woocommerce plugin as well.

I'm using below code to add the menu element and it works fine but I can't get the get_cart_total() showing just after the "Cart" text.

function add_menu_cart_wc($items, $args) {
          if( $args->theme_location == 'primary' ){
          $items .= '<li class="menu-item">'
                  . '<a href="'. wc_get_cart_url() .'">Cart "'. get_cart_total() .'"</a>'
                  . '</li>';
          }
        return $items;
}
add_filter('wp_nav_menu_items', 'add_menu_cart_wc', 10, 2);

Error I'm getting is Call to undefined function get_cart_total()

Thanks!