#include <algorithm>
#include <iterator>
#include <iostream>

int main()
{
  char str[] = "ABCDEfgh";
  std::cout << str << '\n';             // ABCDEfgh 

  char *anfang = std::copy_backward( str, str+5,  str+8 );

  std::cout << "-->" << anfang << '\n'; // -->ABCDE
            << str << '\n';             // ABCABCDE
}