17. Extract the Nibble from an 8-bit Register

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

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    uint8_t nibble=0;
    if(pos==0){
    nibble|=(reg&0x0F);
    }else {nibble|=(reg&0xF0)>>4;}
    return nibble;
}

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