David's Solution

lib/main.dart

@@ -1,3 +1,8 @@
+// Name: Nzeamalu David C.
+// Mobile App Development
+// tag: 08
+
+
 import 'package:flutter/material.dart';
 
 void main() {
@@ -24,7 +29,7 @@ class HomeScreen extends StatefulWidget {
 
 class _HomeScreenState extends State<HomeScreen> {
   //attributes
-  List<String> inputs = ['First Item'];
+  List<String> inputs = ['List of Items'];
   final TextEditingController _controller = TextEditingController();
 
   //method
@@ -34,10 +39,20 @@ class _HomeScreenState extends State<HomeScreen> {
   }
 
   void addInput() {
+    String NewInpute = _controller.text.trim();
+    if (NewInpute.isNotEmpty && !inputs.contains(NewInpute)){
     setState(() {
-      inputs.add(_controller.text);
+      inputs.add(NewInpute);
       _controller.clear();
     });
+    }
+  }
+
+  void resetInputs(){
+    setState(() {
+      inputs.clear();
+      inputs.add('First Item');
+    });
   }
 
   @override
@@ -56,10 +71,22 @@ class _HomeScreenState extends State<HomeScreen> {
             SizedBox(
               height: 5,
             ),
+
+            Row(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
             ElevatedButton(onPressed: addInput, child: Text('Submit')),
             SizedBox(
               height: 10,
             ),
+
+            ElevatedButton(onPressed: resetInputs, child: Text('Reset')),
+            SizedBox(
+              height: 10,
+            ),
+              ],
+            ),
+
             Expanded(
               child: ListView.builder(
                   itemCount: inputs.length,
@@ -73,3 +100,11 @@ class _HomeScreenState extends State<HomeScreen> {
         ));
   }
 }
+
+/*  IN THIS MODIFIED VERSION OF THIS CODE:
+    1.  I added resetInputs() method to clear all the list.
+    2.  I added a new ElevatedButton for resetting the list of Items. This button calls the 'ResetInputs() method when pressed
+    3.  Finally i Modified the addInput() method to trim the input string and check if it's not empty (isNotEmpty) 
+        and if it's not already in the list (!inputs.contains(newInput)). If these conditions are met, 
+        the new message is added to the list. Otherwise, it will just be ignored. 
+*/

pubspec.lock

@@ -67,6 +67,30 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  leak_tracker:
+    dependency: transitive
+    description:
+      name: leak_tracker
+      sha256: "78eb209deea09858f5269f5a5b02be4049535f568c07b275096836f01ea323fa"
+      url: "https://pub.dev"
+    source: hosted
+    version: "10.0.0"
+  leak_tracker_flutter_testing:
+    dependency: transitive
+    description:
+      name: leak_tracker_flutter_testing
+      sha256: b46c5e37c19120a8a01918cfaf293547f47269f7cb4b0058f21531c2465d6ef0
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.1"
+  leak_tracker_testing:
+    dependency: transitive
+    description:
+      name: leak_tracker_testing
+      sha256: a597f72a664dbd293f3bfc51f9ba69816f84dcd403cdac7066cb3f6003f3ab47
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.1"
   lints:
     dependency: transitive
     description:
@@ -79,34 +103,34 @@ packages:
     dependency: transitive
     description:
       name: matcher
-      sha256: "1803e76e6653768d64ed8ff2e1e67bea3ad4b923eb5c56a295c3e634bad5960e"
+      sha256: d2323aa2060500f906aa31a895b4030b6da3ebdcc5619d14ce1aada65cd161cb
       url: "https://pub.dev"
     source: hosted
-    version: "0.12.16"
+    version: "0.12.16+1"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
-      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
+      sha256: "0e0a020085b65b6083975e499759762399b4475f766c21668c4ecca34ea74e5a"
       url: "https://pub.dev"
     source: hosted
-    version: "0.5.0"
+    version: "0.8.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      sha256: a6e590c838b18133bb482a2745ad77c5bb7715fb0451209e1a7567d416678b8e
+      sha256: d584fa6707a52763a52446f02cc621b077888fb63b93bbcb1143a7be5a0c0c04
       url: "https://pub.dev"
     source: hosted
-    version: "1.10.0"
+    version: "1.11.0"
   path:
     dependency: transitive
     description:
       name: path
-      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
+      sha256: "087ce49c3f0dc39180befefc60fdb4acd8f8620e5682fe2476afd0b3688bb4af"
       url: "https://pub.dev"
     source: hosted
-    version: "1.8.3"
+    version: "1.9.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -168,13 +192,13 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
-  web:
+  vm_service:
     dependency: transitive
     description:
-      name: web
-      sha256: afe077240a270dcfd2aafe77602b4113645af95d0ad31128cc02bce5ac5d5152
+      name: vm_service
+      sha256: b3d56ff4341b8f182b96aceb2fa20e3dcb336b9f867bc0eafc0de10f1048e957
       url: "https://pub.dev"
     source: hosted
-    version: "0.3.0"
+    version: "13.0.0"
 sdks:
   dart: ">=3.2.3 <4.0.0"