22. 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 ans=0;
    for(uint32_t i=0;i<32;i++){
        uint32_t ones_pos=(reg>>i)&1U;
        if(i%2==0){
            ans= ans+(ones_pos*(1<<i/2));
        }
    }
    return ans;
}

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