Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    uint32_t res = 0,temp;
    for(int i=0;i<32;i++)
    {
        if(i%2==0)
        {
            temp = (reg & (1<<i));
            if(temp==0)
                continue;
            if(temp!=0)
            {
                res |= (1 << (i/2));
            }
        }
    }
    return res;
}

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

Solving Approach