Airplane Seat Reservation API

Implement a C-style airplane seating API with create, print, free, and reserve functions. The reserve call parses seats like `4B` and may choose an alternate seat when movement is allowed. Requirements Implement the following API: Airplane *createAirplane(int rows, int seats, int isle1, int isle2); void printAirplane(Airplane *airplane); void freeAirplane(Airplane *airplane); int reserveSeat(Airplane *airplane, char seat[], int canMove); reserveSeat should: Return 0 on success and -1 on failure. Parse a 4-byte seat buffer such as 4B or 5H. Reserve the requested seat if it is valid and available. If the requested seat is occupied and canMove is true, choose another valid available seat. Reject invalid row / seat labels and full airplanes. Notes The core signal is low-level data modeling and memory hygiene. Define how rows, seats, aisles, and occupied flags are represented before coding. In C, own the allocation story: one allocation for the struct plus contiguous seat bitmap is simpler to free safely than many nested allocations. Clarify whether isle1 / isle2 are aisle positions that affect printing only or whether aisle letters are not reservable. If the prompt is underspecified, say your assumption and keep the code consistent. Preparation Implement a seat-label parser: split numeric row from alphabetic seat letter, validate bounds, map to an index. Practice a bitmap representation: occupied[row * seats + seat_idx]. Add test cases for invalid labels, occupied seat with canMove=0, occupied seat with canMove=1, and full plane. Be prepared to discuss memory ownership and why freeAirplane must release every allocation exactly once.