title: Delete the first "#" character in a String - Rails
body: <p>How I can delete the first "#" character of a string?</p>
  
  <h3>Example:</h3>
  
  <pre><code>"fooo#oooooo#bar"
  </code></pre>
  
  <h3>Expected result:</h3>
  
  <pre><code>"fooooooooo#bar"
  
  "fooo#oooooo#bar".delete_first("#") // Exist some method like this?
  </code></pre>