Write C++ program for concatenation of two strings using ‘+’ operator overloading. Make necessary assumptions wherever required.

In C++, operator overloading allows us to define how operators behave with user-defined types like classes. To concatenate two strings using the `+` operator, we can overload this operator for a string class. Below is a simple C++ program that demonstrates how to overload the `+` operator for string concatenation.

```cpp
#include <iostream>
#include <cstring>
using namespace std;

class MyString {
    char* str;
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