SOB 25, 27 – (Block 2 – covered in Week 11) 1. Define a struct type to represent a library account with a name, id, number of books currently borrowed, total number of books allowed to borrow for free, money owed. 2. Define five named instances, e.g., “Tom Sawyer”, 1234, 6, 10, 0. 3. A library account owner can borrow a certain number of books for free (as defined in the 4th field). Extra books can be borrowed for a fee of 2 pounds. Write a function that given a library account struct, updates the last field “money owed” depending on how many books are borrowed. E.g., if the number of books borrowed is more than what is allowed, then 2 pounds needs to be added for each extra book borrowed. Given the struct “Mary Jane”, 2334, 12, 10, 0, then the function will store 4 in the last field (2 pounds for each extra book). Explain what the difference between mutable and immutable is.

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