stringByAppendingPathExtension_ method
Implementation
NSString? stringByAppendingPathExtension_(NSString str) {
final _ret = _lib._objc_msgSend_185(
_id, _lib._sel_stringByAppendingPathExtension_1, str._id);
return _ret.address == 0
? null
: NSString._(_ret, _lib, retain: true, release: true);
}