I’m getting a stream of words from server. The objective is to combine the words into a single sentence dynamically. Now what happens is as follows, the values are appended, but the entire string is duplicated whenever a new letter is added.

eg: hi , how are you ?  // stream of words or letters



Expected : hi, how are you?

what im getting is as follows

hi
hi,
hi, how
hi, how are
hi, how are you
hi, how are you ?

My objective is dynamically add this to a string so i can pass that to the ui to render

StringBuffer buffer = StringBuffer();
String newPart = '';

subscription = _channel.stream.listen(
    (message) {
      final actualMessage = message['message']; // from where i get data or values
      if (actualMessage != 'END') {
        newPart += actualMessage;
        buffer.clear();
        buffer.write(newPart);
        debugPrint(buffer.toString().trim());
        add(UiEvent.response(
            message: buffer.toString().trim()));
        // lastMessage = '';
      }
    },
    onError: (error) {
      debugPrint("stream Error $error");
    },
  );

i need to dynamically append data and send it to ui. what am i missing? how can i implement this correctly?