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 val = (reg>>(8-n));
    // uint8_t mask = 0;
    // mask |= ((1<<(8-n))-1);
    reg = (reg<<n);
    // val = val|mask;
    reg |= val;

    return reg;
}

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