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 out_reg = 0;
    for (int i=0;i<=15;i++) {
        out_reg |= ((reg>>(i))&(1U<<i));
    }
    return out_reg;
}

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