refactor: Improve code quality

[Deadreyo]

Type of feature

Select the type of feature request, the lowercase should also be the PR prefix.

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation Update
• 🎨 Style
• 🧑‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🤖 Build
• 🔁 CI
• 📦 Chore (Release)
• ⏩ Revert

Current behavior

Some things are off or can be improved a bit.

Suggested solution

Some examples:

• Declare service.ts files' private functions as private.
• Declare service.ts files' public functions as public (for easier noticing).
• Remove some unneeded brackets
• Any other improvements on the fly.

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