Set minimum purchase to multiples of “x” of products in a specific category

I found online a snippet that allows you to set in the cart a minimum purchase to multiple quantities of “6”.
Here it is:

// start code

add_action( ‘woocommerce_check_cart_items’, ‘woocommerce_check_cart_quantities’ );
function woocommerce_check_cart_quantities() {
$multiples = 6;
$total_products = 0;
foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
$total_products += $values[‘quantity’];
}
if ( ( $total_products % $multiples ) > 0 )
wc_add_notice( sprintf( __(‘You need to buy in quantities of %s products’, ‘woocommerce’), $multiples ), ‘error’ );
}

//end code

I want this rule to be valid only for products belonging to a specific category, with “id = 35”.
All products in other categories can also be purchased in smaller quantities.