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
    int temp = reg;
    int store =0 ;
    while(reg)
    {
        store = store|(reg&1);
        reg = reg >>2;
        store = store<<1;
    }
    if(( temp&1) !=0 )
    {
        store = store >>1;
    }
    return store;
}

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