code: function fitWidth(s, len)
  {
      s = s.trim();
      if(s.length <= len) return [s];
  
      var result = [];
      while(s.length > len)
      {
          var i = len
          for(; s[i] != ' ' && i >= 0; i--) 
              /* empty loop */ ;
  
          if(i == -1)
          {
              for(i = len + 1; s[i] != ' ' && i < s.length; i++) 
                  /* empty loop */ ;
              
              if(i == s.length)
              {
                  result.push(s);
                  return result;
              }
          }
          result.push(s.substr(0, i));
          s = s.substr(i).trimLeft();
      }
      result.push(s);
      return result;
  }
docs: Break a string into lines of len characters and break on spaces
  @param {String} s
  @param {Number} len
  @return {Array.<String>}
  @remarks it might return longers lines if s contains words longer than len