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¿Can someone explain to me what these methods do?

public function postProcess()
    {
        parent::postProcess();

        if (Tools::isSubmit('submitReorder') && $id_order = (int) Tools::getValue('id_order')) {
            $oldCart = new Cart(Order::getCartIdStatic($id_order, $this->context->customer->id));
            $duplication = $oldCart->duplicate();
            if (!$duplication || !Validate::isLoadedObject($duplication['cart'])) {
                $this->errors[] = $this->trans('Sorry. We cannot renew your order.', array(), 'Shop.Notifications.Error');
            } elseif (!$duplication['success']) {
                $this->errors[] = $this->trans(
                    'Some items are no longer available, and we are unable to renew your order.', array(), 'Shop.Notifications.Error'
                );
            } else {
                $this->context->cookie->id_cart = $duplication['cart']->id;
                $context = $this->context;
                $context->cart = $duplication['cart'];
                CartRule::autoAddToCart($context);
                $this->context->cookie->write();
                Tools::redirect('https://www.graficosta.com/carrito?action=show');
            }
        }

        $this->bootstrap();
    }

AND

public function hookActionCartSave()
    {
        $this->calculator->emptyCache();
        if (Tools::getIsset('submitReorder') && $this->duplicate_order) {
            $id_order_old = Tools::getValue('id_order');
            $cookie = new Cookie('reorder');
            $cookie->setExpire(time() + 20 * 60);
            $cookie->id_order_old = $id_order_old;
            $cookie->write();
            $this->duplicate_order = false;
        }

        if (! Validate::isLoadedObject($this->context->cart)) {
            return;
        }

        $id_cart = (int)$this->context->cart->id;
        $id_special = $this->handler->getSpecialProduct();
        if ($id_special) {
            $id_lang = $this->context->language->id;
            $id_shop = $this->context->shop->id;
            $product_special = new Product($id_special, false, $id_lang, $id_shop, $this->context);
            $quantity = $this->context->cart->containsProduct($id_special);
            $quantity = isset($quantity['quantity']) ? (int)$quantity['quantity'] : 0;
            if ($product_special->active &&
                DynamicInput::cartHasCustomization($id_cart)) {
                if (!$quantity) {
                    $this->context->cart->updateQty(1, $id_special);
                } elseif ($quantity > 1) {
                    $this->context->cart->updateQty($quantity - 1, $id_special, null, false, 'down');
                }
            } elseif ($quantity) {
                $this->context->cart->deleteProduct($id_special);
            }
        }

        $where = '';
        $id_guest = (int)$this->context->cookie->id_guest;
        $id_customer = (int)$this->context->cookie->id_customer;

        if ($id_customer && $id_guest) {
            $where = 'AND (id_customer = '.(int)$id_customer.' OR id_guest = '.(int)$id_guest.')';
        } elseif ($id_customer) {
            $where = 'AND id_customer = '.(int)$id_customer;
        } elseif ($id_guest) {
            $where = 'AND id_guest = '.(int)$id_guest;
        }

        if (! empty($where)) {
            $sql = 'UPDATE `'._DB_PREFIX_.$this->name.'_input` 
            SET `id_cart` = '.(int)$id_cart.' WHERE `id_cart` = 0 '.pSQL($where);
            Db::getInstance()->execute($sql);
        }
    }

OrderController.php

dynamicproduct.php