Product parsing_text(string& line)
{//Parsing text from file and building object type Product
    //nazwy zmiennych
    stringstream sstream(line);
    string type, name, quantity;
    double cost = 0;
    size_t code = 0;
    sstream >> type >> name >> quantity >> cost >> code;
    Product::type kind = check_product_type(type);
    quantity = check_product_quantity(quantity);
    return Product(kind, name, quantity, cost, code);
}