I am trying to execute a script on a template in the 'Field and Form' rules to get a variable and append it to the subject line.

I have an onboarding form/template where the HR team will input the username in the form. I am trying to get that name and append it to the 

Current Subject line is 'New Hire Notification'

The two fields in the form that HR will enter are:

'New Employee First Name' Joe

'New Employee Last Name'  Smith

I would like the end result to be '#12345 New Hire Notification Joe Lewis Unclaimed Funds Auditor 4'

The script I have comes close:

This script produces this: '#12345 Joe LewisUnclaimed Funds Auditor 4'...It just needs a space after the name.

var x=$CS.getValue("ServiceReq_User_UDF_CHAR27"); First Name

var z=$CS.getValue("ServiceReq_User_UDF_CHAR1");  Last Name

var u=$CS.getValue("SUBJECT");                 Subject from the ticket 'New Hire Notification', not populating

var v=$CS.getText("GUDF_CHAR27");                 Job Title

var y=x + " " + z + v;

$CS.setValue("SUBJECT",y);

I just want to remove the space: '#12345 Joe Lewis Unclaimed Funds Auditor 4', this would be acceptable. Better would have the existing Subject line included '#12345 New Hire Notification: Joe Lewis Unclaimed Funds Auditor 4'

I have tried editing the script but nothing works.  This seems like it should be simple but I don't know javascript.