Implement a function str$\_$num$\_$multiply$()$ multiply given two input integers num$1$ and num$2$ represented as strings $($type str$),$ return the product of num$1$ and num$2,$ also represented as a string $($type str$).$

Grade:

$50\%$ is given for support of positive numbers

$50\%$ for support of negative numbers

Note: You must not use any built$-$in Integer library or convert the inputs to intTip: Try to remember how a number could be represented, can you break down a number into some smaller parts.

# Use a given base code

def str$\_$num$\_$multiply$($num$1$: str$,$ num$2$: str$)->$ str:

result$\_$str $=""$

# Write your code there you are NOT allowed to use any of the inbuilt function such as str$()$ or int$()$ functions

return result$\_$str

if $\_\_$name$\_\_==\text{'}\_\_$main$\_\_\text{'}$:

# this is an example of how the function should be called and what example values it would take

print$("$result $9*3$: $",$str$\_$num$\_$multiply$("9","3"))$

print$("$result $100*200$: $",$str$\_$num$\_$multiply$("100","200"))$

print$("$result $16*128$: $",$str$\_$num$\_$multiply$("16","128"))$

print$("$result $-5*10$: $",$str$\_$num$\_$multiply$("-5","10"))$

print$("$result $-64*-64$: $",$str$\_$num$\_$multiply$("-64","-64"))$

print$("$result $16*-64$: $",$str$\_$num$\_$multiply$("16","-64"))$