Add more Questions

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Add 10 questions in each chapter:

• Chapter 1 - Basics
• Chapter 2 - Expressions
• Chapter 3 - Structs
• Chapter 4 - Enum & Patterns
• Chapter 5 - Traits & Generics
• Chapter 6 - Operator Overloading & Utilty traits
• Chapter 7 - Closures & Iterators
• Chapter 8 - Collections
• Chapter 9 - Input & Output
• Chapter 10 - Macros