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
    uint64_t extracted_bits = 0ULL;

    for (uint8_t i = 0U; i < 16U; i++){

        extracted_bits |= ((uint64_t)reg >> i) & (uint64_t)(1ULL << i);
    }

    return (uint32_t)extracted_bits;
}

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