Rotate Left in an 8-bit Register

Code

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

uint8_t rotate_left(uint8_t reg, uint8_t n) {
    uint8_t pos = 8 - n;
    uint8_t mask = (1U << n) - 1;
    uint8_t extrac_bits = (reg >> pos) & mask;
    reg = (reg << n) | extrac_bits; 

    return reg;
}

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

Solving Approach