Worked on security hardening and reliability improvements for the NationalSecurityAgency/emissary repository, focusing on mitigating shell and meta-character injection vulnerabilities in file ending values. Addressed this by implementing input sanitization through a cleanFileEnding function and defining a set of invalid characters, ensuring only safe characters are accepted. Integrated this validation into both constructor configuration reads and runtime setter methods, enhancing configuration integrity. Expanded unit testing using JUnit to verify the sanitization logic and its application during configuration and runtime updates. Utilized Java and security best practices throughout, resulting in a more robust and secure handling of file ending inputs.