fix(style): Format using dart format

packages/moxxmpp/lib/src/xeps/xep_0333.dart

@@ -16,11 +16,14 @@ XMLNode makeChatMarkerMarkable() {
 }
 
 XMLNode makeChatMarker(String tag, String id) {
-  assert(['received', 'displayed', 'acknowledged'].contains(tag), 'Invalid chat marker');
+  assert(
+    ['received', 'displayed', 'acknowledged'].contains(tag),
+    'Invalid chat marker',
+  );
   return XMLNode.xmlns(
     tag: tag,
     xmlns: chatMarkersXmlns,
-    attributes: { 'id': id },
+    attributes: {'id': id},
   );
 }
 
@@ -28,36 +31,41 @@ class ChatMarkerManager extends XmppManagerBase {
   ChatMarkerManager() : super(chatMarkerManager);
 
   @override
-  List<String> getDiscoFeatures() => [ chatMarkersXmlns ];
+  List<String> getDiscoFeatures() => [chatMarkersXmlns];
 
   @override
   List<StanzaHandler> getIncomingStanzaHandlers() => [
-    StanzaHandler(
-      stanzaTag: 'message',
-      tagXmlns: chatMarkersXmlns,
-      callback: _onMessage,
-      // Before the message handler
-      priority: -99,
-    )
-  ];
+        StanzaHandler(
+          stanzaTag: 'message',
+          tagXmlns: chatMarkersXmlns,
+          callback: _onMessage,
+          // Before the message handler
+          priority: -99,
+        )
+      ];
 
   @override
   Future<bool> isSupported() async => true;
-  
-  Future<StanzaHandlerData> _onMessage(Stanza message, StanzaHandlerData state) async {
+
+  Future<StanzaHandlerData> _onMessage(
+    Stanza message,
+    StanzaHandlerData state,
+  ) async {
     final marker = message.firstTagByXmlns(chatMarkersXmlns)!;
 
     // Handle the <markable /> explicitly
     if (marker.tag == 'markable') return state.copyWith(isMarkable: true);
-    
+
     if (!['received', 'displayed', 'acknowledged'].contains(marker.tag)) {
       logger.warning("Unknown message marker '${marker.tag}' found.");
     } else {
-      getAttributes().sendEvent(ChatMarkerEvent(
+      getAttributes().sendEvent(
+        ChatMarkerEvent(
           from: JID.fromString(message.from!),
           type: marker.tag,
           id: marker.attributes['id']! as String,
-      ),);
+        ),
+      );
     }
 
     return state.copyWith(done: true);