added solution to hackerrank problem extra long factorials

[SAM33RG]

Fixes #

Checklist

• [ ] I have read the [Contribution Guide] and my PR follows them.
• [ ] My branch is up-to-date with the master branch.
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)
• [ ] The contents added are completelt original and have no copyright issues.

Short description of what this resolves:

Changes proposed in this pull request:

[flaredragon]

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