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;

    for(int i = 0; i < 16; i++) {
        uint32_t bit = (reg >> (2*i)) & 1;
        result |= bit << i;
    }

    return result;
}

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