Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    uint32_t a=0,j=0;
    for(int i=0;i <= 31; i += 2){
        a |= (((reg >> i) & 1) << j);
        j++;

    }
    return a;
    // Your code here
    
}

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