Given a complex Rust code snippet that utilizes raw pointers, unsafe blocks, and manual memory allocation via `libc`, perform a deep analysis of the memory safety guarantees (or lack thereof). Identify potential segmentation faults, data races, or memory leaks. Rewrite the code using safe Rust abstractions (such as `Box`, `Rc`, `Arc`, or `Cow`) to achieve the same functionality without the `unsafe` keyword, explaining how the borrow checker enforces safety in your refactored version.