Organize directories: Move submissions into their respective domain folders

[Copilot]

This PR reorganizes the repository structure to follow the guidelines specified in CONTRIBUTING.md. The expected structure is:

├── problem category (or sub-category)
│   ├── programming language
│   │   └── your code!

Changes Made

1. Moved files from domain root directories to language subdirectories

Previously, many files were directly in domain folders without proper language organization:

• graphs/Dijkstra.cpp → graphs/cpp/Dijkstra.cpp
• greedy_algorithms/*.cpp → greedy_algorithms/cpp/
• misc/mod_inverse_euclidean_algorithm.c → misc/c/
• misc/random_file_name_gen.py → misc/python/
• networking/mail_sender.py → networking/python/
• sorting/TimSort.java → sorting/java/
• sorting/Toplogical sort.cpp → sorting/cpp/
• system_programming/grammar_left_factoring.cpp → system_programming/cpp/
• tictactoe_game/tictactoe.py → tictactoe_game/python/
• dynamic_control/PID_algo_with_documentation.c → dynamic_control/c/

2. Resolved case conflict directories

The repository had several directories with "(Case Conflict)" suffixes that needed to be merged:

• Merged Gnome_sort (Case Conflict) into Gnome_sort
• Merged Heap_sort (Case Conflict) into Heap_sort
• Merged Selection_sort (Case Conflict) into Selection_sort

All files from these conflicting directories were properly organized into their respective language subdirectories.

Results

• 337 code files are now properly organized according to the contributing guidelines
• All files now follow the expected 3-level directory structure: domain/language/code
• No files remain at incorrect depth levels
• All case conflicts have been resolved
• Repository structure is now consistent and maintainable

This organization will make it easier for contributors to find the right location for their submissions and maintain consistency across the repository.

Fixes #67.

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