title: Simpler String slicing in Swift 4
body: <p>Swift 4 changed how strings worked.  However, seems to have got more complicated and less readable.  Can anyone simplify this example (simply gets the third letter of a String as a String)?  (Other than splitting out the lines.)</p>
  
  <pre><code>let myString="abc"
  let thirdLetter = String(myString[myString.index(myString.startIndex, offsetBy: 2)])
  </code></pre>