feat: show exact diff when reformatting needed

Co-authored-by: Ramy <[email protected]>

.github/workflows/check_code_format.yml

@@ -31,6 +31,8 @@ jobs:
           if [[ $(git status --porcelain) ]]; then
              echo "please reformat/fprettify these files:"
              git status --porcelain=v1
+             echo "exact diff:"
+             fprettify --indent 4 --recursive --diff . 2>&1
              exit 1
           fi
 ...