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 result = 0;
    int j = 0;

    for (int i = 0; i < 32; i += 2)
    {
        result |= ((reg >> i) & 1u) << j;
        j++;
    }

    return result;
}

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