Added toString methods

lib/data/dto/game.dart

@@ -6,13 +6,18 @@ class Game {
   final String name;
   final List<Player>? players;
   final Group? group;
-  final String? winner;
+  final String winner;
 
   Game({
     this.players,
     this.group,
-    this.winner,
+    this.winner = '',
     required this.id,
     required this.name,
   });
+
+  @override
+  String toString() {
+    return 'Game{\n\tid: $id,\n\tname: $name,\n\tplayers: $players,\n\tgroup: $group,\n\twinner: $winner\n}';
+  }
 }

lib/data/dto/group.dart

@@ -6,4 +6,9 @@ class Group {
   final List<Player> members;
 
   Group({required this.id, required this.name, required this.members});
+
+  @override
+  String toString() {
+    return 'Group{id: $id, name: $name,members: $members}';
+  }
 }

lib/data/dto/player.dart

@@ -3,4 +3,9 @@ class Player {
   final String name;
 
   Player({required this.id, required this.name});
+
+  @override
+  String toString() {
+    return 'Player{id: $id,name: $name}';
+  }
 }