Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    uint32_t n=0,r=0;
    for(int i=0;i<32;i++)
    {
        if(i%2==0)
        {   
            int g=reg&(1<<i);
            g=g>>i;
            n|=(g<<r++);
            g=0;
            
        }
    }
    return n;
}

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

Solving Approach