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
    size_t i = 0;
    uint32_t res;
    while( i < 32) {
        if ((i % 2) == 0){
            bool bit = (reg & (1U << i));
            // printf("%d\n", bit);
            res |= (bit << (i / 2));
        }   
        i++;
    }
    return res;
    
}

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