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 exract;
    int j=0;
    for(int i=0;i<32;i=i+2) 
    {
        exract|=((reg>>i) &0x01) <<j;
        j++;
    }
    return exract ;
}
int main() {
    uint32_t reg;
    scanf("%u", &reg);
    printf("%u", extract_even_bits(reg));
    return 0;
}