Describe the bug
Can't get to calculate last 3 items positions and sizes.

https://github.com/NBK-Group/ss_bottom_navbar/blob/162435c2eddaef4780c27f6036eadb90f862ec5a/lib/helper/empty_item.dart#L35-L41

To Reproduce
Steps to reproduce the behavior:

1. Clone the repo
2. Run on a real device

Expected behavior
Should be like this.

Screenshots

Smartphone (please complete the following information):

• Android Emulators (first build runs smoothly but after hot restart, the same bug continues)
• Android Device (Android 11)
• iPhone 11 (iOS 14)