Reversing String

[uditiiita]

Hello guys,

I want to reverse a string by storing it in some other location but my code is not working
can somebody help me?
Here is my code:

org 100h

mov bx,0h
mov ah,1h

readStr:
    int 21h
    mov str[bx],al
    inc bx
    
    cmp al,13
    jne readStr

;To Print The Entered String               

mov dl,0Dh
mov ah,2h
int 21h

mov dl,0Ah
INT 21H         

mov str[bx],'$'    

mov ah,09h
lea dx, str
int 21h  
                           
;TO Print The Reverse String
mov dl,0Dh
mov ah,2h
int 21h

mov dl,0Ah
INT 21H  

mov si,0
dec bx
dec bx     

printStr:  

    mov dl,str[bx]
    mov str1[si],dl
    
   
    dec bx      
    inc si    
    
    cmp bx,-1
    jne printStr
    
mov str1[bx],'$'    

mov ah,09h
lea dx, str1
int 21h 

ret

str db ""
str1 db ""