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

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