stringByAppendingPathExtension method
stringByAppendingPathExtension:
Implementation
objc.NSString? stringByAppendingPathExtension(objc.NSString str) {
final $ret = _objc_msgSend_1sotr3r(object$.ref.pointer, _sel_stringByAppendingPathExtension_, str.ref.pointer);
return $ret.address == 0 ? null : objc.NSString.fromPointer($ret, retain: true, release: true);
}