The Second Level

Demonstrate two-level indirection with a "cursor" API. The type is provided in the boilerplate: ``c typedef struct { const int *cur, *end; } IntCursor; ` Implement: `c /* initializes the cursor over [a, a+n); NULL args leave it empty (cur == end == NULL). */ void cursor_init(IntCursor *c, const int *a, size_t n); /* copies the next value into *out and advances; returns 1, or 0 when exhausted (leaving *out untouched). */ int cursor_next(IntCursor *c, int *out); /* rewinds to the start of the original range (no-op if empty). */ void cursor_reset(IntCursor *c, const int *a, size_t n); ``

Difficulty: intermediate