Update "hello world" translation test to comply with C++ standards

[konard]

📋 Summary

This PR implements modern C++ standards compliance for the C# to C++ transformation, specifically addressing how the Program class with Main method is translated.

Changes Made

1. Transform Main Method Signature

   • Changed from: public: static void Main(std::string args[])
   • Changed to: public: void Main(std::vector<std::string> args)
   • Removed static modifier to use instance method (modern C++ RAII pattern)
   • Changed parameter type from C-style array to std::vector for better C++ idiom

2. Added C++ Entry Point Wrapper

   • Generated proper int main(int argc, char* argv[]) function
   • Instantiates Program class using RAII (Program program{};)
   • Converts command-line arguments to std::vector<std::string>
   • Wrapped Main() call in try-catch block for exception handling
   • Returns 0 on success

3. Updated Test Expectations

   • Modified HelloWorldTest to expect the new output format with both the class and main() wrapper

Example Transformation

Input (C#):

using System;
class Program
{
    public static void Main(string[] args)
    {
        Console.WriteLine("Hello, world!");
    }
}

Output (C++):

class Program
{
    public:
    void Main(std::vector<std::string> args)
    {
        printf("Hello, world!\n");
    }
};

int main(int argc, char* argv[])
{
    Program program{};
    try
    {
        program.Main(std::vector<std::string>(argv + 1, argv + argc));
    }
    catch(...)
    {
        // Handle exception
    }
    return 0;
}

Implementation Details

Added a new transformation rule in FirstStage that:

• Uses negative lookahead regex to properly handle nested braces in the Program class
• Transforms the static Main method to an instance method
• Appends the C++ main() wrapper after the class definition
• Follows modern C++ practices as discussed in this article

Testing

✅ All tests pass locally

• EmptyLineTest: ✓ Passed
• HelloWorldTest: ✓ Passed (updated to new format)

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Fixes #13

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[konard]

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