C-Plus-Plus
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feat : add fenwick tree 2D data structure, struct fenwick2D
Description of Change
Checklist
- [x] Added description of change
- [x] Added file name matches File name guidelines
- [x] Added tests and example, test must pass
- [x] Added documentation so that the program is self-explanatory and educational - Doxygen guidelines
- [x] Relevant documentation/comments is changed or added
- [x] PR title follows semantic commit guidelines
- [x] Search previous suggestions before making a new one, as yours may be a duplicate.
- [x] I acknowledge that all my contributions will be made under the project's license.
Notes:
Review existing code and standards: https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/range_queries/fenwick_tree.cpp

Changes have been made.
code looks fine but documentation is not up to standard
changes have been made in the documentation
this seems to be stale