Optimize file reading by switching to stream-based comment filtering

[deepdik]

• Replaced Files.readAllLines() with Files.lines() to enable lazy loading, improving memory efficiency and performance, especially for large files.
• Added a try-with-resources block to ensure the stream is closed automatically after use.
• Streamlined comment filtering by processing lines directly and joining them into a single string without intermediate storage.

This optimization minimizes memory usage and enhances performance by avoiding the overhead of loading the entire file into memory at once.