Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    int n=0;
    int mask=0;
    for(int i=0;i<32;i++)
    {
        if(i%2==0)
        {
            if((reg & (1<<i))==(1<<i))
            {
                n=n | (1<<(i/2));
            } 
            else{
                n=n | (0<<i/2);
            }
        }
    }
    return n;
}

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

Solving Approach