title: How to convert a list of (Char,Int) to a string with the given number of repeated chars?
body: <p>How can I convert <code>[(char,Int)]</code> to a String of the Int in the second component gives the number of repetitions of the character in the first component? For example the input <code>[(a,9),(b,10)]</code> should give <code>["aaaaaaaaa","bbbbbbbbbb"]</code> as output.</p>