How can I make individual git folders inside a git repository
<p>I have this folder layout:</p>

<pre><code>workspace_folder (git repository)
  *  project1 
  *  project2 
  *  project3
  *  ... 
</code></pre>

<p><code>workspace_folder</code> is a git repository, hence the project folders are already version controlled. There have been quite a lot of modifications inside.</p>

<p>How can I make them individual git repositories, while keeping their history?</p>