Fix: Improve repository name extraction and add debug logging

[mcmd]

Fixes #13

Changes

• Added new extractRepoName function to handle all GitHub URL formats consistently:
  • HTTPS URLs (e.g., https://github.com/username/repo)
  • SSH URLs (e.g., git@github.com:username/repo)
  • Short format (e.g., username/repo)
• Added debug logging to help users understand URL processing
• Fixed trailing slash and .git suffix handling

Testing

The fix has been tested with all supported URL formats:

1. HTTPS URL:

git2txt https://github.com/username/repository
# Creates: repository.txt

2. Short format:

git2txt username/repository
# Creates: repository.txt

3. SSH URL:

git2txt git@github.com:username/

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