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 even =0x0000;
    for (int i=0;i<16;i++){
        if (reg &(1 << 2*i)){
            even |= (1 << i);
        }
    }
    return even;
}

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