如何在MFC中分离CString

class MyString {
private:
    char* m_data;
public:
    MyString(const CString& str) {
        // 转换CString为char*
        int length = str.GetLength();
        m_data = new char[length + 1];
        strncpy_s(m_data, length + 1, str.GetBuffer(), length);
        m_data[length] = '\0';
    }

    MyString(const MyString& other) {
        // 拷贝构造函数
        int length = strlen(other.m_data);
        m_data = new char[length + 1];
        strncpy_s(m_data, length + 1, other.m_data, length);
        m_data[length] = '\0';
    }

    ~MyString() {
        // 析构函数
        delete[] m_data;
    }

    MyString& operator=(const MyString& other) {
        // 赋值运算符重载
        if (this != &other) {
            delete[] m_data;
            int length = strlen(other.m_data);
            m_data = new char[length + 1];
            strncpy_s(m_data, length + 1, other.m_data, length);
            m_data[length] = '\0';
        }
        return *this;
    }

    // 其他成员函数和操作符重载...
};

void MyFunction() {
    CString str = "Hello, MFC!";
    MyString myStr(str);  // 使用MyString来代替CString

    // 对myStr进行操作
    MyString myStr2 = myStr;
    MyString myStr3;
    myStr3 = myStr2;
}