I need a clean-coded Android utility app tentatively titled “Celestinu Jonadiu Brito.” The goal is to give users a handy collection of everyday tools—think quick converters, simple calculators, or other lightweight helpers that run smoothly on most recent Android devices. Scope • Design a straightforward Material-style interface that keeps the focus on function, not flash. • Build the core utilities and wire them into a single APK. I’m happy to hear your suggestions on which tools will offer the best everyday value. • Ensure full compatibility across current Android versions, with graceful degradation for older ones still in common use. • Provide the complete, well-commented source code (Android Studio, Kotlin or Java), a signed release APK, and concise setup documentation. • Offer basic guidance for a first-time Play Store submission. Quality matters more than sheer feature count—I prefer a solid, bug-free foundation that we can expand later. If you’ve shipped utility apps before, please share links or repo samples so I can gauge code style and UI approach.