Antonio De Rinaldis issues

Results 4 issues of


                                            Antonio De Rinaldis

`permission_handler` android 13 example notification fix

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...) Bug Fix in the example project, for the main package and android. Solves the following issue...

`permission_handler_android` Fix missing POST_NOTIFICATION permission in android manifest for example projects.

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...) Bug Fix in the example project, for the main package and android. Solves the following issue...

`Permission.notification` `request()` method not working on Android 13 example project.

## 🐛 Bug Report Calling `request()` method on `Permission.notification` does not show system dialog and always returns `PermissionStatus.denied` on Android 13 (Emulator running API: `33` with ABI: `arm64-v8a` system image)....

JS - Leap Year, Circular Linked List and Tree (not binary)

Regarding issue #47 I have added JS code (with comments) for 1. Leap Year 2. Data Structures - Circular Linked List 3. Data Structures - Trees