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
    int res=0;
    for(int i=0, bit_index=0; i<32;i=i+2, bit_index++){
        if((reg >>i) &1){
            res |= (1<<bit_index);
        }
    }
    return res;
}

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