22. Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) 
{
    uint32_t ans = 0, ct =0;

    while(ct<16)
    {
        ans |= ((reg & 1u) << ct);
        reg >>= 2;
        ct++;
    }

    return ans;
}

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