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Fixes #3594 - [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] I know that pull...

harshalkh

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

Stapa1

Created WordLadderTest.java JUnit Tests for WordLadder.java - [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]...

TaranjeetSinghKalsi

Need test cases for many of the Algorithms.

9

There are many algorithm files for which there is no dedicated test file written instead there is a `main()` function that has a demonstration for that. Write test files for...

debasishbsws

Added function and fixed bug in PerfectCube.java

1

Added another function to PerfectCube.java and fixed a testing mistake in line number 9 - [x] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Java/blob/master/CONTRIBUTING.md). - [x] This pull request is all my own work...

TaranjeetSinghKalsi

Create insertionSort.java

2

### **Describe your change:** - [ ] Add an algorithm? - [ ] Fix a bug or typo in an existing algorithm? - [ ] Documentation change? #### References ###...

parte-Ajinkya

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

Yukta-Jaiswal

- [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] I know that pull requests will...

TaranjeetSinghKalsi

optimized code from O(n) to O(1) and added comments - [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...

TaranjeetSinghKalsi

Create MergeSort.java

1

### **Describe your change:** - [ ] Add an algorithm? - [ ] Fix a bug or typo in an existing algorithm? - [ ] Documentation change? #### References ###...

parte-Ajinkya