MyString::MyString(const char *str) {     if(!str)     {         m_data = new char[1];         strcpy(m_data, "\0");     }     else     {         int len = strlen(str);         m_data = new char[len + 1];         strcpy(m_data, str);     } } MyString::MyString(const MyString &other) {     int len = strlen(other.m_data);     m_data = new char[len + 1];     strcpy(m_data, other.m_data); } MyString::~MyString(void) {     delete []m_data;     m_data = nullptr; } MyString& MyString::operator=(const MyString &other) {     if(this != &other)     {         delete []m_data;         m_data = nullptr;         int len = strlen(other.m_data);         m_data = new char[len + 1];         strcpy(m_data, other.m_data);     }     return *this; }