During November 2025, Lee Dayoung developed a reusable Two Sum Problem Solver for the DaleStudy/leetcode-study repository, focusing on algorithm design and clean code practices in Go. The function efficiently identifies index pairs in an array whose values sum to a given target, supporting rapid test-case generation and enhancing interview preparation resources. Lee documented the approach thoroughly and maintained clear, traceable commit messages, demonstrating disciplined use of Git for version control. While no bugs were reported or fixed during this period, the work showcased strong problem-solving skills and a solid grasp of data structures, contributing practical tooling to the repository’s utilities.