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
    uint8_t val = 0;
    for (int i = 0; i < n; i++) {
        val |= ((reg >> (8 - n + i)) & 1u) << i;
    }

    return (reg << n) | val;
}

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