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 even_bits = 0;
    int even_shift = 0;
    for (int i = 0; i < 32; i += 2, even_shift++)
    {
        if (reg & (1 << i))
        {
            even_bits |=  (1 << even_shift);
        }
    }
    return even_bits;
}

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