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 lret = 0;
    for(int i = 30; i >= 0; i = i-2)
    {
        if((reg >> i) & 0x1)
            lret |= 1;
        if(i>0)
            lret = lret << 1;
    }
    return lret;
}

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