StringBuffer -> StringBuilder and other modernizations#20

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GlenKPeterson wants to merge 2 commits intojeremyh:masterfrom GlenKPeterson:master

+64-9

Commits on Nov 23, 2020

- Replaced StringBuffer with StringBuilder because it is more efficient.
GlenKPeterson
committed
Added .gitignore to avoid checking in Intellij or Maven files.
GlenKPeterson
committed