Removing Carriage Return at the end of output message

In my scenario, we are using JMS channel to send the message from PI to third party.

But in the channel output, we are seeing extra line at the end of the record. This is causing problem in loading the file on the reciever side as they don't want extra space at the end of the file. Where exactly the changes are required to resolve this?

Please guide me in handling this issue and to remove this new line from the record.