Worked on the glotzerlab/hoomd-blue repository to improve the accuracy and reliability of Hard Particle Monte Carlo (HPMC) energy calculations. Addressed a bug in the energy kernel by ensuring that energy contributions are computed only when a selected particle pair exists and their distance falls within the cutoff, thereby eliminating spurious energy terms. This targeted fix enhanced the physical fidelity of molecular dynamics simulations and reduced the risk of misleading energy metrics. The work demonstrated careful attention to numerical correctness and maintainability, leveraging expertise in C++, high-performance computing, and molecular dynamics to support more accurate scientific results and reporting.