Rename the CTCI chapters

[yadunandanbhat]

It's better if the chapters CTCI folder are renamed so that they're sorted numerically.

[yadunandanbhat]

I would love to help

[Ziniddoug]

CTCI

Chapter 1: Introduction and Big O
Chapter 2: Arrays and Strings
Chapter 3: Linked Lists
Chapter 4: Stacks and Queues
Chapter 5: Trees and Graphs
Chapter 6: Bit Manipulation
Chapter 7: Object-Oriented Design
Chapter 8: Recursion and Dynamic Programming
Chapter 9: System Design and Scalability
Chapter 10: Sorting and Searching
Chapter 11: Testing
Chapter 12: C and C++
Chapter 13: Java
Chapter 14: Databases
Chapter 15: Threads and Locks
Chapter 16: Moderate Problems
Chapter 17: Hard Problems
Chapter 18: Additional Topics

These are the corresponding chapter names in English based on the Portuguese translation provided. Please note that the chapter names may vary depending on the edition of the book.