contact model for dummy working

packages/simplex_app/lib/model/contact.dart

@@ -0,0 +1,33 @@
+import 'dart:convert';
+
+class Contact {
+  final String? name;
+  final String? msg;
+  final String? msgTime;
+
+  Contact({this.name, this.msg, this.msgTime});
+
+  factory Contact.fromJson(Map<String, dynamic> json) {
+    return Contact(
+        name: json['name'], msg: json['msg'], msgTime: json['msgTime']);
+  }
+
+  static Map<String, dynamic> toJson(Contact contact) {
+    return {
+      'name': contact.name,
+      'msg': contact.msg,
+      'msgTime': contact.msgTime,
+    };
+  }
+
+  static String encode(List<Contact> contacts) => json.encode(
+        contacts
+            .map<Map<String, dynamic>>((contact) => Contact.toJson(contact))
+            .toList(),
+      );
+
+  static List<Contact> decode(String? contacts) =>
+      (json.decode(contacts!) as List<dynamic>)
+          .map<Contact>((item) => Contact.fromJson(item))
+          .toList();
+}