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
    uint32_t result;
    uint8_t cnt = 0;
    for(uint8_t i = 0; i < 31; i++)
    {
        if(i%2 == 0)
        {
            uint32_t tmp = (reg >> i)&1;
            result |= tmp << cnt;
            cnt++;
        }
    }
    return result;
}

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