Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
   uint16_t res = 0;
    for(int i = 0; i < 16; i++)
    {
        res = res | ((reg >> (2*i)) & 1) << i;
    }
    return res ;
    
}

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