public function store(Request $request)
    {


        $this->validate($request,
                          ['username'=>'required'],
                          ['password'=>'required']
                       );

        $user = $request->input('username');
        $pass = Crypt::encryptString($request->input('password'));


        $users = DB::table('admin')->where(['nama'=>$user, 'password'=>$pass])->first();
        if(count($users)==0){

           return redirect('/')->with('failed','Login gagal');

        } else

        if($user == $users->nama AND $pass == $users->password ){

            return redirect('/admin');

        } else {

             return redirect('/')->with('failed','Login gagal');

        }

    }