Worked on the rust-lang/rustfmt repository to enhance the handling of Unicode whitespace in Rust string literal line continuations, addressing a nuanced formatting issue. The approach involved implementing a more precise method for stripping Unicode whitespace, rather than relying on the standard char::is_whitespace, and documenting the rationale to support future maintainability. Expanded the test suite to cover a broader range of Unicode whitespace scenarios, ensuring robustness and reducing the risk of regressions in string literal formatting. Utilized Rust and testing frameworks to deliver a targeted bug fix, improving the accuracy and reliability of the formatter when processing diverse Unicode inputs.