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==0){ 
    reg = reg | 0xf0; reg = reg & 0x0f;
     return reg; } 
     
    else if(pos==1)
    { reg = reg | 0x0f;
     reg = reg & 0xf0; 
     reg = reg >>4;
    return reg; }
}

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