Remove commas between categories in product slider

Hi,
I customize product slider in order to show catagories adding following code to functions.php:
function my_shop_display_categories() {
global $product;
if ( $product->get_categories() ) {
echo ‘<div class=”product-meta”>’ . $product->get_categories() . ‘</div>’;
}
}add_action( ‘woocommerce_after_shop_loop_item’, ‘my_shop_display_categories’, 9 );

Now I see categories in product slider, and I would like to remove commas between them.
I browser through woocommerce template files and enfold product slider shortcode file, but no joy.

Any help?

Thank you