recursive - iterative

bla foo(int* fooptr, const int* barptr, int ndim, const int* ab, const int* cd) {
  if (ndim == 1) {
    for (int i = 0; i < ab[0]; i++) {
      fooptr[i] = barptr[i*cd[0]];
    }
  }
  else {
    for (int i = 0; i<ab[0]; i++) {
      bla bob = foo(&fooptr[i*ab[1]], &barptr[i*cd[0]], ndim - 1, &ab[1], &cd[1]);
       if (bob.str != nullptr) {
          return bob;
        }
      }
    }
  return peter();
}