Find and fix the errors in this C++ code

In this task, you need to identify and fix issues in the following C++ program fragment. Pay attention to the correctness of inheritance and calling base class methods.

# include <iostream>
using namespace std;

class RawHardDisk {
    public:
    RawHardDisk() {
    cout << "RawHardDisk constructor called" << endl;
    }
    void attach() {
    cout << "Disk attached" << endl;
    }
};

class CBTHardDisk: public RawHardDisk {
    public:
    CBTHardDisk() {
    cout << "CBTHardDisk constructor called" << endl;
    }
};

class SCSIHardDisk: public RawHardDisk {
    public:
    SCSIHardDisk() {
    cout << "SCSIHardDisk constructor called" << endl;
    }
};

class OVirtHardDisk: public SCSIHardDisk, public CBTHardDisk {}
}

int main() {
    OVirtHardDisk disk;
    disk.attach();
    return 0;
}

Fix the code so that it compiles and correctly outputs messages about constructor calls and the attach method.