Book Availability Checker Solution

Problem Statement

Given an array of book objects, where each object contains a unique book identifier `bookId` and a boolean indicating its availability `isAvailable`, implement a function to check if a book exists and its availability. The function should return a boolean array where the first element indicates the existence of the book and the second element indicates its availability.

Constraints

• command cannot be empty
• command is either find or add
• book_title should not exceed 100 characters
• author should not exceed 50 characters
• input line should end with a newline character
• member_name should not exceed 20 characters

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