Make the name of the function more agnostic.

lib/main.dart

@@ -67,14 +67,14 @@ class _HomePageState extends State<HomePage> {
         throw UnimplementedError('No widget for page $pageSelected yet!');
     }
 
-    Widget newExpense() {
+    Widget newValue() {
       return AlertDialog(title: Text("Add New Value"), content: dialog);
     }
 
     Widget? floatingButton;
     if (dialog != null) {
       floatingButton = IconButton(
-        onPressed: newExpense,
+        onPressed: newValue,
         icon: Icon(Icons.add),
         color: Theme.of(context).colorScheme.onSurface,
       );