simple widget tree with managing data with each

lib/main.dart

@@ -1,18 +1,10 @@
 import 'package:flutter/material.dart';
 
+import './product_manager.dart';
+
 void main() => runApp(MyApp());
 
-class MyApp extends StatefulWidget {
-  @override
-  State<StatefulWidget> createState() {
-    // TODO: implement createState
-    return _MyAppState();
-  }
-}
-
-class _MyAppState extends State<MyApp> {
-  List<String> _products = ['Test'];
-
+class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -22,27 +14,7 @@ class _MyAppState extends State<MyApp> {
       ),
       body: Column(
         children: [
-          Container(
-              margin: EdgeInsets.all(10),
-              child: RaisedButton(
-                onPressed: () {
-                  setState(() {
-                    _products.add('Advanced Food Tester');
-                  });                  
-                },
-                child: Text('Click Me!'),
-              )),
-          Column(
-            children: _products
-                .map((elem) => Card(
-                        child: Column(
-                      children: <Widget>[
-                        Image.asset('assets/food.jpg'),
-                        Text(elem)
-                      ],
-                    )))
-                .toList(),
-          ),
+          ProductManager('Test'),
         ],
       ),
     ));