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 res=0;
    reg&=0x55555555;
    for(uint8_t i=0,j=0;i<32;i++)
    {
        if((reg>>i)&1)
        {
           res|=(1<<j++);
        }
    }
    return res;
    
}

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

Solving Approach