docs: public void delete(long orderId) {
      Order order = orders.get(orderId);
      if (order == null) {
        return;
      }
  
      OrderBook book = order.getOrderBook();
  
      boolean bbo = book.update(order.getSide(), order.getPrice(), -order.getRemainingQuantity());
  
      orders.remove(orderId);
  
      listener.update(book, bbo);
    }