Updated itoa

section .text
  global _start

%include "includes/print.asm"      ; syscall to print to screen function
%include "includes/leave.asm"      ; syscall to exit program

itoa:
  push ebp
  mov ebp, esp
  mov ebx, 0                       ; i = 0
itoa_start:
  mov esi, [ebp+8]
  mov edi, [ebp+12]
  xor edx, edx                     ; clear edx
  mov eax, esi
  mov ecx, 10                      ; move 10 into ecx (divisor)
  div ecx                          ; div ecx (ex. 1234 / 10 = 1234.5)
  mov [ebp+8], eax
  add edx, '0'                     ; add '0' (48) to remainder to convert into ASCII (5 -> '5')
  mov [edi + ebx], dl
  cmp eax, 0                       ; compare remainder (edx ex. .5) to 0
  je itoa_end                      ; if remainder == 0 jump to end label
  add ebx, 1                       ; increase ebx value by 1
  jmp itoa_start
itoa_end:
  add ebx, 1                       ; increase ebx value by 1 for terminating string
  mov dword [edi + ebx], 0
  mov eax, edi
  mov esp, ebp
  pop ebp
  ret

_start:
  push res
  push num
  call itoa
  pop ebx

  mov ecx, eax
  mov edx, 5
  call print                       ; print res string

  call leave


section .data

  num dd 12345                     ; Defining word num with value 12345

section .bss

  res resd 6                       ; Reserving double word of 6 for res variable