Rotate Left in an 8-bit Register

Code

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

uint8_t rotate_left(uint8_t reg, uint8_t n) {
    // Your code here
    uint8_t bit_mask = 0;
    for(uint8_t i = 0 ; i < n; i++)
    {
        bit_mask = reg & 0x80;
        reg = reg << 1;
        reg |= (bit_mask>>7);
    }
    return reg;
}

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

Solving Approach