For testing use command:
node index.js [path-to-file]

For example:

• Success without any notices: node index.js ./test-icons/menu-good.svg or node index.js ./test-icons/empty.svg
• Found elemеnt or property which can not be removed unnoticed: node index.js ./test-icons/android.svg or node index.js ./test-icons/nike.svg
• Merge paths without removing elements: node index.js ./test-icons/only-merges.svg