Fix starting files copying to preserve filenames without special prefixes

[Copilot]

When creating a new submission, starting files were being copied incorrectly. The code was using substr(1) to remove the first character from all starting file names, assuming they all had special prefixes like ^. However, some starting files are meant to be regular files without prefixes.

This caused issues where regular files like helper_functions.py would be corrupted to elper_functions.py in the student workspace.

Changes Made

• Modified src/blockpy.js to import the existing chompSpecialFile function from files.js
• Replaced file.filename().substr(1) with chompSpecialFile(file.filename()) in the file reset logic
• The chompSpecialFile function correctly handles both cases:
  • Files with special prefixes (!^?&$*#) have their prefix removed
  • Regular files without prefixes are preserved unchanged

Before and After

Before (broken):

// Always removes first character
let filename = file.filename().substr(1);
// "^starting_code.py" → "starting_code.py" ✓ 
// "helper_functions.py" → "elper_functions.py" ✗

After (fixed):

// Only removes special prefixes
let filename = chompSpecialFile(file.filename());
// "^starting_code.py" → "starting_code.py" ✓
// "helper_functions.py" → "helper_functions.py" ✓

The fix ensures that starting files are properly copied to the student workspace with correct filenames, resolving the issue where files prepended with ^ appeared verbatim in the student space when they should have been processed appropriately.

Fixes #105.

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