[PDFBOX Refactoring] Refactored the Code to resolve some Design & Implementation Code Smells.

[AnkushMudgal]

Refactored the code to address certain code smells in a small subsection of the code. The following refactoring was applied to various files/methods/fields.

• Extract Method
• Rename field/variable/method
• Move Method
• Pull-Up Method
• Push-Down Variable

All stages of maven build, including compile, test, and install passed after the changes were made. {There were warning during compilation for deprecated methods, which were present before the above changes.}