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;
    uint32_t value_to_extract;
    for(uint32_t i=0; i<16;i++){
        value_to_extract = 1 & (reg >> 2*i);
        res |= (value_to_extract << i);
    }
    return res;
}

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