$[30]<2\mathrm{.}9>$ Write a program in LEGv$8$ assembly to convert an ASCII string containing a positive or negative integer decimal string to an integer. Your program should expect register X$0$ to hold the address of a null$-$terminated string containing an optional $+$ or $$ followed by some combination of the digits $0$ through $9.$ Your program should compute the integer value equivalent to this string of digits, then place the number in register X$0.$ If a non$-$digit character appears anywhere in the string, your program should stop with the value $1$ in register X$0.$ For example, if register X$0$ points to a sequence of three bytes $50$ten, $52$ten, $0$ten $($the null$-$terminated string $24),$ then when the program stops, register X$0$ should contain the value $24$ten. The ARMv$8$ MUL instruction takes two registers as input. There is no $$MULI$$ instruction. Thus, just store the constant $10$ in a register.

Do not give the whole implementation. Just the LEGv$8$ code, like:

LOOP:

SUBIS X$1,$ X$1,$ #$1$

B$.$LE DONE

ADDI X$0,$ X$0,$ #$2$

B LOOPDONE: