Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    uint16_t res = 0; 

    for (int i = 0; i < 16; i++)
    {
        // check if bit is set in reg
        if (((reg >> (i * 2)) & 1) == 1)
        {
            // place bit in res
            res |= (1 << i);
        }
    }

    return res;
}

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

Solving Approach