simplifyAt method
Implementation
String simplifyAt(int index,
    {bool trim = true,
    bool collapseSpaces = true,
    bool lowerCase = true,
    String nullValue = ''}) {
  var self = this;
  return self != null && index < self.length
      ? self.elementAt(index).simplify(
          trim: trim,
          collapseSpaces: collapseSpaces,
          lowerCase: lowerCase,
          nullValue: nullValue)
      : '';
}