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 even;
    for (int pos= 0; pos <= 30; pos+= 2) even |= ((reg & (1U << pos)) >> (pos/2));
    return even;    
}

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