Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) 
{
  if(pos==0)
  {
   reg = (reg & 0x0F);
    return reg;
  }
  else
  {
   reg =  (reg & 0XF0) >> 4;
    return reg;
  }
  
}

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

Solving Approach