title: Concatenate a list of strings to one string haskell
body: <p>I have a list of strings (see below) how do I concatenate these strings into one list containing one string.</p>
  
  <pre><code>["hello","stack","overflow"] 
  </code></pre>
  
  <p>to  </p>
  
  <pre><code>["hellostackoverflow"]
  </code></pre>
  
  <p>I am just allowed to import Data.Char and Data.List</p>