'Left Shift subroutine in LC3 not working for when the value in R3 is 0

I have to write a subroutine to calculate the value stored at R2 to left-shift by the value stored at R3 (R2 << R3). The result is saved at R3. So far I have this:

leftSHIFT   ADD R0,R2,R2 
            ADD R3,R3,#-1  
            BRz MyEXIT 
            ADD R2,R0,#0 
            BRnzp leftSHIFT 
MyEXIT      ADD R3,R0,#0 
            RET

Now this code works correctly for other inputs like 004<003=032 . However, what I'm getting is 001<000=000 when I should be getting 001<000=001

assemblybit-shiftlc3


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