the following subprogram sub$1$program is supposed to return the sum of two words in memory. But it has MAJOR problems. Please find and fix them. Copy the sub$1$ subprogram, modify this subprogram so that it correctly observe the MIPS register conventions and the use of the stack.

$.$data

step$1$: $.$asciiz $"$In Main

$"$

$.$text

$.$globl main

main:

$1$a $a$0,$ step$1$ #Print $"$In Main"$\text{'}$

li $v$0,4$

syscall

Jal sub$1$

exit:

li $v$0,10$

syscall

# sub$1$ adds two words

the resuits, then jumps to sub$2.$

# There are MAJOR problems in this subroutine. I need you to

# fix them please.

$.$text

sub$1$:

lw $s$0,$ word$1$

lw $s$1,$ word$2$

add $t$1,$ $s$0,$ $s$1$

jal sub$2$

jr $ra

$.$ data

word$1$: $.$word $40$

word$2$: $.$word $50$

step$2$: $.$asciiz $"In$ sub$1"$

# sub$2$ is good in every way. Please, please, do not change it$.$ sub$2$:

# Print Step$3$

la $$a0,$ Step $3$

li $$v0,4$

syscall

# Jump back to sub$1$

jr $$ra$

$.$ data

step$3$: $.$asciiz $"$In sub$2"$