Merge branch '9-clean-code' into 'master'

Resolve "Clean code"

Closes #9

See merge request !9

android/gradle.properties

 org.gradle.jvmargs=-Xmx1536M
 android.useAndroidX=true
 android.enableJetifier=true
-app.versionName=0.0.7
-app.versionCode=7
+app.versionName=0.0.8
+app.versionCode=8

lib/provider/data.dart

 import 'package:flutter/foundation.dart';
 
 class Data extends ChangeNotifier {
-
-  // randomization
   bool _searchingImage = false;
   String _image = '';
 

lib/screens/home.dart

 import 'package:flutter/material.dart';
-import 'package:provider/provider.dart';
-
-import '../provider/data.dart';
 
 class Home extends StatelessWidget {
   static const String id = 'home';
 
   @override
   Widget build(BuildContext context) {
-    Data _myProvider = Provider.of<Data>(context);
-
     return Scaffold(
       appBar: AppBar(
         title: Text('Sorting game'),

test/widget_test.dart

-// This is a basic Flutter widget test.
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility that Flutter provides. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
-
-import 'package:flutter/material.dart';
-import 'package:flutter_test/flutter_test.dart';
-
-import 'package:sortgame/main.dart';
-
-void main() {
-}