Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    uint32_t temp =0; 
    uint32_t index = 0; 
    while (reg){
        temp |= (reg&0x01) << index; 
        reg = reg >> 2; 
        index++; 
    }
    return temp;
}

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

Solving Approach