title: Move n characters from front of string to the end
body: <p>It seems like an easy problem, but i can't find solution. I want to take first, let's say 2 letters from string, and move them to the end of this string. So for example, OK12 would become 12OK.</p>
  
  <p>edit: So far i've tried cutting string off, then adding it to the rest of the string, but i tought there's a one-line solution for that, like predefined function or something.</p>