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 temp_reg;
    for(int i =0;i<16;i++)
    {
        bool temp= (reg>>(i*2)&0x01);
        temp_reg = temp_reg | (temp<<i);
    }
    return temp_reg;
}

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