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)
       nibble = (reg >> 4);
    else
       nibble = (reg & 0xF);

    return nibble ;
}

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