JaeHyeon developed a Simple Sum Calculator Tool for the hyemi0622/algorithm repository, focusing on streamlining basic arithmetic validation within algorithmic workflows. Using C++ and applying algorithm implementation skills, JaeHyeon designed a reusable add function alongside a main interface that enables straightforward user interaction. This approach reduced repetitive code for arithmetic testing and established a foundation for future expansion to additional operations. The tool reads two integers and outputs their sum, supporting faster validation of math logic in algorithms and unit tests. Over the course of one month, JaeHyeon delivered a single, well-scoped feature without addressing bug fixes.