Extract Even Bits Only from 32-bit Register

Code

#include <stdio.h>
#include <stdint.h>

uint32_t extract_even_bits(uint32_t reg) {
    uint32_t res = 0;
    for(int i = 0; i< 32; i+=2)
    {
    if(((reg>>i)&1))
    {
        res<<=1;
        res |= ((reg>>i)&1);
        
    }
        //res <<=1;
    }
    return res;
}

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

Solving Approach