17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    //We have 8 bit and need to extract 4 bit nibble
    unsigned char reg1;
    if(pos == 0){
         return reg & 0x0F;           // lower nibble
    }
    else if(pos == 1){
        return (reg >> 4) & 0x0F;
    }
}

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