title: Add Multiple items of a List to one line in another List
body: <p>Imagine I've this following <code>List</code>: </p>
  
  <pre><code>List&lt;string&gt; thirdList = new List&lt;string&gt; {"0","0","56'BCD"}
  </code></pre>
  
  <p>I need to add all of its items to a new list as one value i.e., <code>"0 0 56'BCD</code>. Please note that there is space between the items in the new string. Thanks in advance. </p>