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 t=0;
    for (int i=15;i>=0;i--)
    {
        t=t<<1;
        t|=reg>>(2*i) & 1;
    }
    return t;
}

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