title: How to print the same char n times in Haskell
body: <p>I would like to print a char underlining a String n times, with n the length of the String in Haskell.</p>
  
  <p>How should I do this?</p>
  
  <p>My String is: "Available Chars (x)" 
  and I want to have a char underlining that sentence, which should have exactly the same length as the "Available Chars (x)". But x is an int, so it could be "1" or "10" or "1000" etc.. so the length is variable.  I got the length but i didnt know how to print that char as long as the string is... </p>