Hello so I was working on my NASM assembly assignment where I am supposed to add two "single$-$digit numbers" where the answer can't go past $9$ since $10$ is double digit. So i have my code below and when it gets to entering in the second number it does this weird thing where it won't let me answer the prompt that I gave and skips to the result message and cuts out of the program. I do all of my code in a Linux VM$.$ Also if there is a way to help with debugging where I can print what is coming out that would help a lot.

BITS $32$

SECTION $.$data

add$1$msg db "single $",0$

add$2$msg db "another $",0$

resultmsg db "The sum of these two numbers is: $",0$

newline db $0$xA

SECTION $.$bss

numstore$1$ resb $1$

numstore$2$ resb $1$

result resb $1$

SECTION $.$text

global $\_$start

$\_$start:

mov eax, $4$ ;sys call$($sys$\_$write$)$

mov ebx, $1$ ; sys call$($std$\_$out$)$

mov ecx, add$1$msg ; The message

mov edx, $7$ ; length of message

int $0$x$80$ ; call kernel

;Read in the first number

mov eax, $3$

mov ebx, $0$

mov ecx, numstore$1$

mov edx, $1$

int $0$x$80$

;Convert the first number from ASCII to integer

mov al$,[$numstore$1]$

sub al$,\text{'}0\text{'}$

mov bl$,$ al

;Prompt user for the second number

mov eax, $4$

mov ebx, $1$

mov ecx, add$2$msg

mov edx, $8$

int $0$x$80$

;Read in the second number

mov eax, $3$

mov ebx, $0$

mov ecx, numstore$2$

mov edx, $1$

int $0$x$80$

;Convert the second number from ASCII to integer then add to first number

mov al$,[$numstore$2]$

sub al$,\text{'}0\text{'}$

add bl$,$ al

add bl$,48$

mov $[$result$],$ bl

;mov eax, $4$

;mov ebx, $1$

;mov ecx, resultmsg

;mov edx, $33$

;int $0$x$80$

;mov eax, $3$

;mov ebx, $0$

;mov ecx, result

;mov edx, $1$

;int $0$x$80$

;mov eax, $4$

;mov ebx, $1$

;mov ecx, newline

;mov edx, $1$

;int $0$x$80$

mov eax, $1$

int $0$x$80$