Khalil coats code review#21

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KhalilxCoats wants to merge 2 commits intoSWE-CS410:mainfrom

KhalilxCoats:Khalil_Coats_CodeReview

Commits on Jun 15, 2023

Added final implementation of Stringmanipulation class.
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Updated StringManipulationTest.java with final testing implementation.
KhalilxCoats
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