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 result = 0;
    int i = 30;

    while(i>=0){
        result = result | ((reg>>i)&0x01);
        // printf("%b, %b\n",result, (reg>>i));
        result = result<<1;
        i -=2;
    }
    result = result>>1;
    return result;
}

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