Feature/chapter1

[frinfo702]

This pull request includes significant changes to the chapter_01/p01_is_unique.py file, focusing on simplifying the codebase by removing redundant functions and updating function signatures. The most important changes are:

Refactoring and simplification:

• Updated function signatures to use type hints and renamed parameters for consistency (string to s).
• Removed redundant functions: is_unique_chars_using_dictionary, is_unique_chars_using_set, is_unique_chars_sorting, and is_unique_chars_sort.

Testing adjustments:

• Commented out the removed functions from the test cases in the Test class.