title: How to "crop" characters off the beginning of a string in Rust?
body: <p>I want a function that can take two arguments <code>(string, number of letters to crop off front)</code> and return the same string except with the letters before character <em>x</em> gone.</p>
  
  <p>If I write</p>
  
  <pre><code>let mut example = "stringofletters";
  CropLetters(example, 3);
  println!("{}", example);
  </code></pre>
  
  <p>then the output should be:</p>
  
  <pre class="lang-none prettyprint-override"><code>ingofletters
  </code></pre>
  
  <p>Is there any way I can do this?</p>