wordpress - WooCommerce add to cart form

I am trying to insert add to cart form.

function testing(){
$product = new Wc_product(14); // 14 = product id
echo $product->get_image().'<br>'.woocommerce_template_single_add_to_cart();
}
add_acttion('wp_footer','testing')

woocommerce_template_single_add_to_cart function is:

function woocommerce_template_single_add_to_cart() {
global $product;
do_action( 'woocommerce_' . $product->product_type . '_add_to_cart' );
}

But $product results in empty [product_type]

I think i am going in wrong direction. Can some one guide how to get add to cart form?

Thanks