laravel helloworld route not found

I have below laravel route

Route::get('/', function () {
//return view('welcome');
return "Hello...";
});

And I type url like below in browser address bar

http://localhost/restapi/public/

It return me

Hello...

But when I add new route like below

Route::get('/hello', function () {
return "this is hello ..";
});

I receive below error message for http://localhost/restapi/public/hello

via Chebli Mohamed