private function uploadFoto(KaryawanRequest $request)
    {
      $foto = $request->file('foto') ;
      $ext = $foto->getClientOriginalExtension();

      if($request->file('foto')->isValid()){
        $namaFoto = md5(date('YmdHis')).".$ext";
        $upload_path = 'assets/uploads';
        $request->file('foto')->move($upload_path, $namaFoto);
        return $namaFoto;
      }
      return false;
    }