Rotate Left in an 8-bit Register

Code

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

uint8_t rotate_left(uint8_t reg, uint8_t n) {
    const uint8_t reg_size = sizeof(reg) * CHAR_BIT; 
    n %= reg_size; // optimize rotation compute
    reg = ((reg << n) | (reg >> (reg_size - n))); // OR the right shift left shift
    return reg;
}

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

Solving Approach