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 res = 0, index = 0;
    for(uint32_t i = 0; i < 32; i += 2)
    {
        uint32_t evenbits = (reg >> i) & 1;
        res |= (evenbits << index);
        index++;
    }
    return res;
}

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