Worked on the helix-editor/helix repository to improve the stability of the Prompt module by addressing a crash related to grapheme handling in terminal UI. Focused on bug fixing using Rust, specifically replacing the use of unwrap() with map_or(0, |g| g.width()) to safely manage None grapheme values during cursor position calculations. This change prevented potential panics and ensured correct cursor behavior when no grapheme was present. The approach demonstrated careful application of Rust’s error handling patterns and contributed to the reliability of a core editor feature, emphasizing robust terminal UI development and safe handling of text processing edge cases.