feat: add comprehensive unit tests for core functions

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity and
+orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment:
+
+- Demonstrating empathy and kindness toward other people
+- Being respectful of differing opinions, viewpoints, and experiences
+- Giving and gracefully accepting constructive feedback
+- Accepting responsibility and apologizing to those affected by our mistakes
+- Focusing on what is best for the overall community
+
+Examples of unacceptable behavior:
+
+- The use of sexualized language or imagery, and sexual attention or advances
+- Trolling, insulting or derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Scope of Use
+
+This project is a security research and authorized penetration testing tool.
+Contributors and users must only apply it against systems they own or have
+explicit written authorization to test. Discussion, code, or contributions
+that promote unauthorized access, malicious use, or illegal activity are not
+tolerated and will be removed.
+
+## Enforcement Responsibilities
+
+Project maintainers are responsible for clarifying and enforcing our standards
+of acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+## Reporting
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the project maintainer at **nsh531@gmail.com**. All complaints
+will be reviewed and investigated promptly and fairly.
+
+## Enforcement Guidelines
+
+Maintainers will follow these Community Impact Guidelines in determining the
+consequences for any action they deem in violation of this Code of Conduct:
+
+1. **Correction** — Private, written warning for a single incident.
+2. **Warning** — Warning with consequences for continued behavior.
+3. **Temporary Ban** — Temporary ban from any sort of interaction or public
+   communication with the project for a specified period of time.
+4. **Permanent Ban** — Permanent ban from any sort of public interaction
+   within the project community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.1, available at
+https://www.contributor-covenant.org/version/2/1/code_of_conduct.html.
+
+[homepage]: https://www.contributor-covenant.org