22. Extract Even Bits Only from 32-bit Register

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

int main() {
    uint32_t reg;
    uint32_t result = 0;
    int out_pos = 0;

    scanf("%u", &reg);

    for (int i = 0; i < 32; i += 2) {
        uint32_t bit = (reg >> i) & 1U;
        result |= (bit << out_pos);
        out_pos++;
    }

    printf("%u", result);
    return 0;
}