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 val = 0;
    uint8_t pos = 0;

    while (reg > 0) {
        uint8_t temp = reg & 1;
        val = val | (temp << pos);
        pos++;
        reg = reg >> 2;
    }
    return val;
}

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