Giulio Tantaro

### Describe your change: Contributes to #9943 * [ ] Add an algorithm? * [ ] Fix a bug or typo in an existing algorithm? * [x] Add or change...

### Describe your change: Add doctests to dijkstra_2.py Contributes to https://github.com/TheAlgorithms/Python/issues/9943 * [ ] Add an algorithm? * [ ] Fix a bug or typo in an existing algorithm? *...

- [x] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Java/blob/master/CONTRIBUTING.md). - [x] This pull request is all my own work -- I have not plagiarized it. - [x] All filenames are in PascalCase. -...

Add tests Tower of Hanoi

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- [x] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Java/blob/master/CONTRIBUTING.md). - [x] This pull request is all my own work -- I have not plagiarized it. - [x] All filenames are in PascalCase. -...

Add tests mergesortedarray and add check list null

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- [x] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Java/blob/master/CONTRIBUTING.md). - [x] This pull request is all my own work -- I have not plagiarized it. - [x] All filenames are in PascalCase. -...

Add tests Generic Heap and add check null item

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- [x] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Java/blob/master/CONTRIBUTING.md). - [x] This pull request is all my own work -- I have not plagiarized it. - [x] All filenames are in PascalCase. -...

cleanup combination and combination test

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Related to https://github.com/TheAlgorithms/Java/issues/5164 - [x] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Java/blob/master/CONTRIBUTING.md). - [x] This pull request is all my own work -- I have not plagiarized it. - [x] All filenames are...

Add tests for NodeStack and rework

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- [x] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Java/blob/master/CONTRIBUTING.md). - [x] This pull request is all my own work -- I have not plagiarized it. - [x] All filenames are in PascalCase. -...