title: Check if a string is rotation of another WITHOUT concatenating
body: <p>There are 2 strings , how can we check if one is a rotated version of another ?</p>
  
  <p><code>For Example : hello --- lohel</code></p>
  
  <p>One simple solution is by <code>concatenating</code> first string with itself and checking if the other one is a <code>substring</code> of the concatenated version. </p>
  
  <p>Is there any other solution to it ? </p>
  
  <p>I was wondering if we could use <code>circular linked list</code> maybe ? But I am not able to arrive at the solution.</p>