31. Rotate Left in an 8-bit Register

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

uint8_t rotate_left(uint8_t reg, uint8_t n) {
    uint16_t mask = ~((1<<7) -1);
    for (size_t i(0); i<n; ++i)
    {
        uint8_t MSB = (mask & reg) >>7;
        reg= (reg<<1) + MSB;
    }
    
    return reg;
}

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