Refactor reflow_table() function using extract function technique

[coderabbitai]

Description

The reflow_table() function in lib.rs should be refactored using the "extract function" technique to improve code maintainability and readability.

Scope

• Refactor the reflow_table() function by extracting smaller, focused functions
• Consider moving the new related functions to a new reflow.rs file for better organisation

Context

This refactoring request was made by @leynos to improve the codebase structure.

References

• Pull Request: Add missing table reflow test cases #42
• Original Comment: Add missing table reflow test cases #42 (comment)

Requested by: @leynos