Mansi

Sieve of eratosthenes

2

- [ ] 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. - [ ] All filenames are...

Added PowerOfFour algorithm in bitmanipulation

1

- [ ] 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. - [ ] All filenames are...