title: Generate Random String
body: <p>How do you generate codes that should be 16 digits in length, unique, made up of 1-9, a-z and A-Z (case sensitive obviously so Abc1 is not the same as abc1) ex: Ahs78D7xkEshud45</p>
  
  <p>I tried doing this but cannot seem to figure out the easiest way.</p>
  
  <p>Thanks for your help!</p>