17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    

    if(pos == 0)
    {
        unsigned char lower = reg & 0x0F;
        return lower;
    }

    unsigned char upper = reg & 0xF0;
    return (upper >> 4);

}

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