fix: remove memory leak `iterative_factorial.cpp`

[vil02]

Description of Change

There is a memory leak in iterative_factorial.cpp while throwing an exception. This PR fixes it and does some other small changes.

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: Removes memory leak in iterative_factorial.cpp.

[CarlosZoft]

@vil02, some suggestions.. pls resolve the conflits

[vil02]

@vil02, some suggestions.. pls resolve the conflits

@CarlosZoft luckily there were no conflicts, just my branch was out-of-date. It is fixed now.

[github-actions[bot]]

This pull request has been automatically marked as abandoned because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[vil02]

@Panquesito7, @realstealthninja: Merry Christmas and please dont-close.

[github-actions[bot]]

This pull request has been automatically marked as abandoned because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[vil02]

Please add dont-close or merge.