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Summary by Bito

This pull request introduces a new VulnerableApp class in Java that demonstrates various security vulnerabilities for educational purposes, enhances password security by replacing MD5 with bcrypt in Python, and improves input validation and error handling in Go for IP checks and file uploads.

Detailed Changes

• Introduces VulnerableApp class in src/main/sample.java with multiple security vulnerabilities including command injection, SQL injection, and insecure deserialization.
• Replaces weak MD5 hashing with bcrypt in sample.py to improve password security.
• Enhances IP address validation in user.go by adding octet range checks and improves error handling for file uploads.