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;
    for(int i=0;i<32;i++)
    {
        if(i%2==0 && reg !=0)
        {
            res <<= 1;
            res|= (reg & 1);
        }
        reg >>= 1;
    }
    
    return res;
}

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