Create UniqueAlgo

[Saloni899]

Here i give an algorithm for remove consecutive duplicate elements from a range (e.g., a container like a std::vector) and return an iterator pointing to the new end of the range.

Description of Change

Checklist

• [ ] Added description of change
• [ ] Added file name matches File name guidelines
• [ ] Added tests and example, test must pass
• [ ] Added documentation so that the program is self-explanatory and educational - Doxygen guidelines
• [ ] Relevant documentation/comments is changed or added
• [ ] PR title follows semantic commit guidelines
• [ ] Search previous suggestions before making a new one, as yours may be a duplicate.
• [ ] I acknowledge that all my contributions will be made under the project's license.

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