Refactor create_file

[bugdea1er]

Move out the common code

[Copilot]

Pull Request Overview

This PR refactors the temporary file creation logic by extracting the file reopening functionality into a separate function, aiming to reduce duplicate code.

• Introduces a new function, reopen_file, for reopening temporary files.
• Updates create_file to use the new reopen_file function and improved error handling.

Comments suppressed due to low confidence (2)

src/file.cpp:102

• Undefined variable 'mode' used in _wfreopen; consider replacing it with the passed in 'mdstring' to correctly specify the file open mode.

file = _wfreopen(path.c_str(), make_mdstring(mode), file);

src/file.cpp:85

• The file pointer is passed by value to reopen_file, so reassigning it inside the function will not update the caller's variable. Consider passing it by reference (std::FILE*&) or returning the updated file pointer.

void reopen_file(const fs::path::value_type* mdstring, std::FILE* file, std::error_code& ec) noexcept {