Production‑grade C11 contact manager: a single portable binary with SQLite storage, Argon2id password hashing, interactive keyboard menu and full non‑interactive CLI. Features CSV import/export with transactional dry‑run, JSON output for scripting, backups, and unit/integration tests for reliable automation.
What is the SagarBiswas-MultiHAT/Contact-Management-System GitHub project? Description: "Production‑grade C11 contact manager: a single portable binary with SQLite storage, Argon2id password hashing, interactive keyboard menu and full non‑interactive CLI. Features CSV import/export with transactional dry‑run, JSON output for scripting, backups, and unit/integration tests for reliable automation. ". Written in C. Explain what it does, its main use cases, key features, and who would benefit from using it.
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