rooting

• use routes:{key:val,...}

• import layout

  import 'package:app9/pages/choose_location.dart';
  import 'package:app9/pages/home.dart';
  import 'package:app9/pages/looding.dart';
  import 'package:flutter/material.dart';
  
  void main() => runApp(MaterialApp(
        initialRoute:'/',
        routes: {
          '/': (context) => Loading(),
          '/home': (context) => Home(),
        },
      ));
  

• don't use duplique roationg, like:

  runApp(
      Home(),
      routes:{'/home'}
  )