31. Rotate Left in an 8-bit Register

#include <stdio.h>
#include <stdint.h>

uint8_t rotate_left(uint8_t reg, uint8_t n) {
    // Your code here
    n = n%8;
    // uint8_t new_reg = reg >> (8-n);
    // uint8_t mask = (1 << n)-1; 
    // new_reg = new_reg & mask;
    // return (reg << n) | new_reg;
    return (reg << n) | (reg >> (8 - n));
}

int main() {
    uint8_t reg, n;
    scanf("%hhu %hhu", &reg, &n);
    printf("%u", rotate_left(reg, n));
    return 0;
}