title: fatal: A branch named 'new_branch' already exists
body: <p>I've created a branch with name of <code>xyz_api</code>
  But when trying to switch in git by following command:</p>
  
  <pre><code>git checkout -b xyz_api
  </code></pre>
  
  <p>it returns following error</p>
  
  <blockquote>
    <p>fatal: A branch named 'xyz_api' already exists.</p>
  </blockquote>