Write a C++ program to move the first two characters to the end of a given string of length at least two

#include <iostream>
using namespace std;
string test(string s1)
         {
              string s2=s1;
              return s1.erase(0, 2) + s2.substr(0, 2);
         }
int main()
 {
  cout << test("Hello") << endl;
  cout << test("JS") << endl;
  return 0;
}