Use of Redundant Code

Redundant code directly undermines maintainability and indirectly harms security. When the same logic exists in multiple places, fixing a bug or vulnerability in one location is easily missed in another, leaving the system partially patched and inconsistently protected. This inconsistency becomes a breeding ground for security gaps that are difficult to track and eliminate. For developers, the solution is to consolidate duplicate code into a single, well-defined function or service. This practice, often called the DRY (Don't Repeat Yourself) principle, ensures that fixes and security improvements are applied universally. It reduces codebase size, simplifies testing, and makes the application more secure and easier to audit over its entire lifecycle.