#include <algorithm>
#include <iostream>

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

  char *ende = std::copy( str+3, str+8, str );

  std::cout << "v----" << ende << '\n' // v----FGH 
            << str << '\n';            // DEFGHFGH
}