Worked on the charmbracelet/x repository to deliver a core UI rendering improvement focused on string width calculations for terminal interfaces. Addressed inaccuracies in grapheme cluster handling and alignment by replacing the uniseg library with displaywidth, resulting in more precise handling of complex Unicode and ANSI sequences. This technical approach improved both the accuracy and speed of string manipulation, directly enhancing UI rendering and layout reliability for diverse text content. Utilized Go for implementation, with an emphasis on performance optimization and advanced string manipulation. The work established a stronger foundation for higher-level features that depend on correct width calculations in terminal UIs.