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 ans =0;
    int i =0;
    while(reg)
    {
      if(reg & 1)
      {
        ans |= 1 << i;
        i++;
      }
      else
      {
        ans &= 1 << i;
        i++;
      }
      reg = reg >> 2;
    }
    return ans;
}

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

Solving Approach