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 re=0;
          int o=0;
          for(int i=0;i<32;i+=2){
            if ((reg>>i)&1){
                re |=(1U<<o);
            }
            o++;
          }
          return re;
}

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