Program is in c++

The string class is provided in the C++ library Provide your own implementation for the following functions (name the new class MyString): MyString(const char ch, int size); MyString(const char chars[], int size); MyString append(const MyString& s); MyString append(const MyString& s, int index, int n); MyString append(int n, char ch) MyString assign(const char" chars); MyString assign(const MyString& s, int index, int n); MyString assign (const MyString& s, int n); MyString assign (int n, char ch); MyString substr(int index, int n) const; Mystring substr(int index) const; MyString erase(int index, int n)