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
    unsigned int res = 0;
    for (unsigned int i = 0; i < 16; i++){

        unsigned int even = reg & ( 1 << (i * 2)); 
        res |= even >> i;

    }
    return res;
   
}

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

Solving Approach