Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    uint32_t regg=0;
    int j=0;
    for(int i=0;i<32;i=i+2)
    {
        
        if(reg & (1<<i))
        {
            regg |=(1<<j);
        }
        else
        regg &=~(i<<j);
    
       ++j;
    }
    return regg;
    
}

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

Solving Approach