$6.(50$ pts$)$ Build an assembly language subroutine named SuperfyR$0$ that will find the largest of the

values in the registers R$0,$ R$1,$ R$2,$ and R$3$ and copy that value into R$0.$ For example, if R$0$ contains $28,$

R$1$ contains $15,$ R$2$ contains $3,$ and R$4$ contains $77$ when your subroutine is called, when your

subroutine is finished R$0$ will contain $77,$ R$1$ will contain $15,$ R$2$ will contain $3,$ and R$4$ will contain $77.$

Your subroutine must be placed at address $0$x$30$ in program memory and must use only instructions

that are contained in the CS$150$ AVR instruction subset. Your subroutine cannot use any data memory

locations or any registers other than R$0,$ R$1,$ R$2,$ and R$3$ to solve this problem. $($Note: Only these $30$ instructions should be used ADD, ADC, CP$,$ CPI, NEG, COM, AND, ANDI, EOR, OR$,$ ORI, LSR$,$ ASR, BRBC$,$ BRBS$,$ JMP$,$ RJMP$,$ CALL, RCALL, RET, RETI, MOV, IN$,$ OUT, LDI, LDS$,$ PUSH, POP, NOP, STS$)$