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 mask=0; // Your code here
    int pos=0;
    for(int i=0;i<32;i+=2){
       if((reg>>i)& 1){
        mask|=(1<<pos);
       }
       pos++;
    }
    return mask;
}

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