17. Extract the Nibble from an 8-bit Register

#include <stdio.h>
// 10101011 <<1 = 01010110
//
unsigned char extractNibble(unsigned char reg, int pos) {
    unsigned char extractbit; 
    if (pos == 0){
    extractbit = (reg<<pos)& 0x0F;
    }
    else{
    extractbit = (reg>>4) & 0x0F ;
    }
    return (int)extractbit;
}

int main() {
    unsigned char reg;
    int pos;
    scanf("%hhu %d", &reg, &pos);
    printf("%d", extractNibble(reg, pos));
    return 0;
}