LC3 assembly code bug

The code works perfect except it outputs a space at the end of the binary output. anyone can fix it so it does not have a space at the end?

ex: value is x0 I want it to output "0000 0000 0000 0000//n" but it outputs "0000 0000 0000 0000 //n" <--get rid of space at the end.

I want to change code as little as possible, thumbs up for any quick answer that works

code:

.ORIG x3000

;-------------

;Instructions

;-------------

LD R1, Convert ; R6 <-- Address pointer for Convert

;LDR R1, R6, #0 ; R1 <-- VARIABLE Convert

;-------------------------------

;ENTER CODE HERE

;--------------------------------

;clear R5

AND R5, R5, #0

;set R5

ADD R5, R5, #15

;clear R3

AND R4, R4, #0

;Set R4.

ADD R4, R4, #4

;loop

LOOP

;Add R4

ADD R4, R4, #0

;Go to nextnibble

BRp NEXTNIBBLE

;load ' '

LEA R0, free ;this is where the issue is, i want the space every 4 numbers but not after the 16th/last one

; display space

TRAP x22

;clear R4

AND R4, R4, #0

;Set R4

ADD R4, R4, #4

;Update R5

ADD R5, R5, #0

;Jump to end next nibble

BR ENDNEXTNIBBLE

;label next nibble

NEXTNIBBLE

;Get R1

ADD R1, R1, #0

;jump to label IFSTAMT if R1 is negative

BRn IFSTAMT

; if positive then print 0

LEA R0, stringzero

; instruction to print 0

TRAP x22

;jump to ENDIFSTAMT

BR ENDIFSTAMT

;label IFSTAMT

IFSTAMT

;Load string 1

LEA R0, stringone

;Display 1

TRAP x22

;label ENDIFSTAMT

ENDIFSTAMT

;Move to next bit

ADD R1, R1, R1

;Decrease R5

ADD R5, R5, #-1

;Decrease R4

ADD R4, R4, #-1

;label ENDNEXTNIBBLE

ENDNEXTNIBBLE

;go to loop

BRzp LOOP

;load new line

LEA R0, newLine

;print newline

PUTS

;Stop the program

HALT

;---------------

;Data

;---------------

;Convert_addr .FILL x3040 ; The address of where to find the data

count .FILL #16

count2 .FILL #4

stringone .STRINGZ "1"

stringzero .STRINGZ "0"

free .STRINGZ " "

newLine .STRINGZ " "

;.ORIG x3040 ; Remote data

Convert .FILL xABCD ; <----!!!NUMBER TO BE CONVERTED TO BINARY!!!

;---------------

;END of PROGRAM

;---------------

.END