Extract Even Bits Only from 32-bit Register

#include <stdio.h>
#include <stdint.h>
uint32_t extract_even_bits(uint32_t reg) {
    uint32_t reg1=0;
    char temp =0;
    int i;
    for (i = 0;i<16;i++){
     temp = (reg>>(2*i)) &1;
     reg1 |= (temp<<i);
    }
    return reg1;
}

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