[INLONG-213] Optimize code & Minor changes

[dockerzhang]

Optimize code

List messageList = new ArrayList<>();
if (transferedMessageList == null || transferedMessageList.isEmpty()) {
      return messageList;
}
change to
if (transferedMessageList == null || transferedMessageList.isEmpty()) {

return new ArrayList<>();

}

List messageList = new ArrayList<>(transferedMessageList.size());

for (int i; i < 0; i++) {}
change to
for (Object o; objects) {}

String.valueOf(consumerGroup).trim();
change to
consumerGroup.trim();

etc..

JIRA link - [INLONG-213] created by viviel