Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    unsigned char res=0;
    if(pos == 0)
    {
        
        return ((res |= (reg << 4)) >> 4);
     }
    else if(pos == 1)
    {
        return res |= (reg >>4);
       
    }
}

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

Solving Approach