   users, _ := ioutil.ReadDir("/tmp/results/")  for _, user := range users {   repos, _ := ioutil.ReadDir("/tmp/results/" + user.Name() + "/")   for _, repo := range repos {    file, err := os.Open("/tmp/results/" + user.Name() + "/" + repo.Name() + "/" + toolname)    check(err)     fi, err := file.Stat()    check(err)     if fi.Size() == 0 {     continue    } else if fi.Size() > 0 {      if _, err0 := io.Copy(of, file); err0 != nil {      return err0     }     