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_mask =0x55555555;
    uint32_t check_even = reg & even_mask; //extract even
    uint32_t value = 0;//final value
    for (uint32_t i=0;i<=30;i=i+2){
        uint32_t compress_mask = 1U<<i;
        uint32_t k=i/2;
        uint32_t extract = (check_even & compress_mask)>>k;
        value = value + extract;
    }
    return value;
}

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