Apply clang-format to all C/C++ source files for consistent code formatting

[Copilot]

This PR implements proper code formatting across the entire codebase using clang-format, addressing the need for consistent code style and maintainability.

Changes

Code Formatting

• Applied clang-format to 76 C/C++ source files (.c, .cpp, .h, .hpp) in the workspace
• Excluded _unmaintained directory to preserve legacy code as-is
• All changes are purely cosmetic (whitespace, indentation, spacing) with no functional modifications

Configuration

Added .clang-format configuration file with style settings that balance consistency with existing code patterns:

• Indentation: Tabs (4 spaces wide)
• Brace Style: Linux style (opening brace on next line for functions)
• Line Length: 120 characters maximum
• Pointer Alignment: Right-aligned (char *ptr not char* ptr)
• Spacing: Consistent spacing around operators, keywords, and function calls

Documentation

• Created CONTRIBUTING.md with comprehensive guidelines for contributors including:
  • How to install and use clang-format
  • Commands for formatting code before submitting PRs
  • Instructions for verifying formatting
  • Editor integration tips
• Updated README.md to reference the new contributing guide

Benefits

• Consistency: Uniform code style across the entire codebase
• Maintainability: Easier to read, review, and maintain code
• Automation: Contributors can automatically format their code with a single command
• Quality: Reduces formatting-related discussions in code reviews
• Standards: Establishes a clear coding standard for future contributions

Verification

All files have been verified to:

• Pass clang-format validation with zero errors
• Maintain syntactic correctness
• Produce reproducible formatting

Contributors can now format their code with:

find workspace -type f \( -name "*.c" -o -name "*.cpp" -o -name "*.h" -o -name "*.hpp" \) | grep -v "_unmaintained" | xargs clang-format -i

Closes #[issue_number] (if applicable)

Original prompt

Proper code formatting. Use clang-format.

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