Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    uint32_t ans=0;
    for(int i=0;i<16;i++)
    {
        int source=2*i;
        int extract=(reg>>source)&1;
        ans |= (extract<<i);
    }
   
    return ans;
}

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

Solving Approach