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;

    if(pos == 0){
        nibble = reg & 0xFU;
    }else{
        nibble = (reg >> 4) & 0xFU;
    }

    return nibble;

}

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