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Description
In classes Alcohol, Fruit and Item add the missing methods and their implementations.
// override from Cargo
size_t getPrice() const override;
std::string getName() const override { return name_; }
size_t getAmount() const override { return amount_; }
size_t getBasePrice() const override { return base_price_; }
Cargo& operator+=(size_t amount) override;
Cargo& operator-=(size_t amount) override;
bool operator==(Cargo& cargo) const override;