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
    uint32_t result = 0;

    for (int i = 0; i < 16; i++)
    {
        uint32_t bit = (reg >> (2 * i)) & 1U;   // get even-positioned bit
        result |= (bit << i);                  // pack it consecutively
    }

    return result;
}

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