fix

lib/provider/token.dart

@@ -1,4 +1,5 @@
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
 class TokenNotifier extends Notifier<String> {
   @override
@@ -8,6 +9,16 @@ class TokenNotifier extends Notifier<String> {
 
   setToken(String token) {
     state = token;
+    SharedPreferences.getInstance().then((prefs) {
+      prefs.setString("token", token);
+    });
+  }
+
+  removeToken() {
+    state = '';
+    SharedPreferences.getInstance().then((prefs) {
+      prefs.setString("token", "");
+    });
   }
 }