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Summary by Bito

• Replaces weak MD5 hashing algorithm with robust bcrypt implementation in sample.py to enhance security.
• Improves input validations and directory security for file uploads in user.go.
• Introduces a new Java module, VulnerableApp, that adds a comprehensive demonstration of potential security issues and problematic coding practices.
• Overall summary: Delivers critical security enhancements in sample.py and user.go while introducing a new VulnerableApp module for demonstrating common security vulnerabilities.