* feat: kadane's algorithm added
* file renamed to kadanes3.cpp and clang-tidy warnings fixed
* updating DIRECTORY.md
* DIRECTORY.md and kadanes3.cpp modified
* change integer types to int64_t and uint64_t, as per the requirements.
* clang-format and clang-tidy fixes for 5025b93a
* Apply suggestions from code review
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: David Leal <halfpacho@gmail.com>
