Write a RISC$-$V OTTER assembly language subroutine that sums the values in the seven least

significant nibbles in $10,$ then multiples that summed value by $2$ raised to power of the most

significant nibble in $10.$ Store the final result in $10.$

Minimize the number of instructions in your program

Comment your code appropriately

Include a banner that describes the operation of your subroutine