Syntax refactoring

[belowsky26]

These are the changes made to the code between the two versions, along with some context on what each change does and why it was made:

1. Changed the description of WebSearchTool in web_search.py.
2. Renamed extract_last_tool_messages function in lang_graph_util.py to something more descriptive.
3. Modified the unit tests for file operations to include a test case for the scenario where there is no newline at the end of the file.
4. Updated the test.c file to reflect a change made to the code, specifically adding and removing lines.
5. Changed the description of WebSearchInput in web_search.py.
6. Modified the function format_issue_info in issue_util.py to format the issue information more clearly.

I hope this helps! Let me know if you have any further questions.