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 == 1)
            {
                    // Upper nibble
                            return (reg >> 4) & 0x0F;
                                }
                                    else if (pos == 0)
                                        {
                                                // Lower nibble
                                                        return reg & 0x0F;
                                                            }

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