Extract Even Bits Only from 32-bit Register

#include <stdio.h>
#include <stdint.h>

uint32_t extract_even_bits(uint32_t reg) {
    uint32_t extracted_val = 0;
    for (int i = 0; i < 16; i++) {
        if ((reg >> i*2) & 1) {
            extracted_val |= (1U << i);
        }
    }
    return extracted_val;
}

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