17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {

    if(pos == 0) //extract lower nibble
    {

        reg &= 0b00001111;

    } 

    else
    {
        reg = (reg & 0b11110000) >> 4;
    }

    return reg;
    // Write your code here
}

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