title: xor on two hexadeicmal values stored as string in c++
body: <p>I have two hexadecimal values which is stored as string:</p>
  
  <pre><code>string md5OfPath("a77e0a3e517e0a9d44c3a823d96ca83c");
  string guidValue("c3b491e559ac4f6a81e527e971b903ed");
  </code></pre>
  
  <p>I want to perform XOR operation on both the values in C++.
  Can you please suggest me on how I can perform the xor operation.</p>