kaspersky problem #1: cpp

// https://habr.com/article/353768/
// problem #1
#include <string>
#include <memory>
#include <iostream>
#include <iomanip>
class Item
{
public:
    virtual ~Item() { }
    Item(const char* data): m_data(std::make_unique<std::string>(data)) {  }
    Item(Item&& obj): m_data(std::move(obj.m_data)) { }

    virtual const std::string GetContent() const { return m_data ? *m_data : ""; }
private:
    std::unique_ptr<std::string> m_data;
};
class ItemEx : public Item
{
public:
    ItemEx(const char* data, const char* dataEx): Item(data), m_dataEx(std::make_unique<std::string>(dataEx)) {  }

    ItemEx(ItemEx&& obj)
        : Item(std::move(obj))
        , m_dataEx(std::move(obj.m_dataEx))
    { }

    virtual const std::string GetContent() const override { return Item::GetContent() + (m_dataEx ? *m_dataEx : ""); }
private:
    std::unique_ptr<std::string> m_dataEx;
};
void Func()
{
    ItemEx item("123", "456");
    std::cout << item.GetContent() << std::endl;
    ItemEx newItem = std::move(item);
    std::cout << newItem.GetContent() << std::endl;
    std::cout << item.GetContent() << std::endl;
}
int main()
{
    Func();
}