Extract Even Bits Only from 32-bit Register

Code

#include <stdio.h>
#include <stdint.h>
int bit,pos,res;
uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    res=0,pos=0;
    for(bit=0;bit<=31;bit+=2)
    {
        if(reg & (1<<bit))
        {
            res |=(1<<pos);
        }
        pos++;
    }
    return res;
}

int main() {
    uint32_t reg;
    scanf("%u", &reg);
    printf("%u", extract_even_bits(reg));
    return 0;
}

Solving Approach