Assembly concatenate

Question

I'm new to assembly, I have 3 variables, str1 str2 str3. The program will ask the user for a string input and store it in str1 and str2 and for str3, it contains the concatenated value of str1 and str2, is there anyway to do this? this is my code.

.model small
.stack 
.data
    msg1 db 13,10,"Enter a string>> $"
    msg2 db 13,10,"Concatenated: $"
    str3 db 20 dup(?),"$"
    
    v1 label byte
    v2 db 11
    v3 db 0
    str1 db 11 dup("#")

    g1 label byte
    g2 db 11
    g3 db 0
    str2 db 11 dup("@")

.code 
    mov ax,@data
    mov ds,ax 
    
    mov ah,9
    lea dx, msg1    ;;PROMPTS INPUT
    int 21H

    mov ah, 0AH     ;;ACCEPTS STRING INPUT
    lea dx, v1      ;;stores in 1st container = v1
    int 21H    

    mov ah, 0AH     ;;ACCEPTS STRING INPUT
    lea dx, v2      ;;stores in 2st container = v2
    int 21H
    
    mov ah,4ch
    int 21h

END