22. Extract Even Bits Only from 32-bit Register

#include <stdio.h>
#include <stdint.h>

uint32_t extract_even_bits(uint32_t reg) {
    uint32_t input=0;
    int k=0;
    for(int i=0;i<=30;i+=2){
        if(reg&(1<<i)){
            input|=(1<<k);
            k++;
        }
    }
    return input;
}

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