title: How to convert big hex strings to decimal strings?
body: <p>I am working with big numbers in Rust, my inputs come in as hex strings and I am using a hash function which has done all the heavy lifting with large numbers, all I need to do is to provide it with decimal string versions of the numbers (not hex).</p>
  <p>What would be the best practice to convert hex strings to their equivalent decimal representation, whilst staying within strings in order not to cause any overflow issues?</p>