* The singly linked list implementation contains critical memory allocation errors, allocating only `sizeof(data)` instead of the full `Node` structure. * The choice of `void *next` for linked list pointers severely compromises C's strong type safety and mandates excessive pointer casting. * The recursive BFS function is fundamentally flawed, attempting array-based queue deletion mid-recursion, which is inefficient and highly unstable. * Global state dependency, particularly the shared `head` pointer, inhibits module reusability for managing multiple independent lists. * Refactor the data structure logic to separate core operations from I/O, as current functions unnecessarily incorporate `print_list()` calls.
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