code: function repeat(ch, count)
  {
      var s = '';
      for(var i = 0; i < count; i++)
          s += ch;
      return s;
  }
docs: Create new string with ch repeated count times
  @param {String} ch character to repeat (should have length = 1)
  @param {Number} count number of repetitions of ch
  @return {String}