update 'convert_path' fn to recognise sub-dirs for #348

[mpadge]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.25000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.12%. Comparing base (19bd9a6) to head (39f880c).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
R/format-checks.R	90.54%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #349      +/-   ##
==========================================
- Coverage   92.25%   92.12%   -0.14%     
==========================================
  Files          46       46              
  Lines        3604     3620      +16     
==========================================
+ Hits         3325     3335      +10     
- Misses        279      285       +6     

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