Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
if(pos==0)
   { reg = reg & 0x0F;
  // printf("%d", reg);
    return reg;
   }
 else if(pos==1)
    {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;
}

Solving Approach