Split into multiple files

lib/states/my_app_states.dart

@@ -0,0 +1,23 @@
+library;
+
+import 'package:english_words/english_words.dart';
+import 'package:flutter/material.dart';
+
+class MyAppState extends ChangeNotifier {
+  var current = WordPair.random();
+  var favourites = <WordPair>[];
+
+  void getNext() {
+    current = WordPair.random();
+    notifyListeners();
+  }
+
+  void toggleFavourites() {
+    if (favourites.contains(current)) {
+      favourites.remove(current);
+    } else {
+      favourites.add(current);
+    }
+    notifyListeners();
+  }
+}