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 pos = 0;

    for (int i = 0; i < 32; i += 2) {
        uint32_t bit = (reg >> i) & 1;

        result |= (bit << pos);

        pos++;
    }

    return result;
}

int main() {
    uint32_t reg;

    scanf("%u", &reg);

    printf("%u\n", extract_even_bits(reg));

    return 0;
}