ZoneRental

Internal refactoring: Migrated three additional command classes from Java to Kotlin.

Kotlin Conversions

• RefundHistoryCommand.kt - Migrated from Java (130 → 109 lines, 16% reduction)

  • Switch statement → Kotlin when expression
  • Loop with index → forEachIndexed
  • String templates for cleaner formatting

• ListCommand.kt - Migrated from Java (79 → 76 lines, 4% reduction)

  • Complex if/else chain → when expression with destructuring
  • Smart cast for Player type checking
  • Nullable handling with Pair returns

• VerifyCommand.kt - Migrated from Java (94 → 83 lines, 12% reduction)

  • Unchecked casts → safe casts with filterIsInstance
  • For loops → forEach
  • Type-safe map access with null defaults

Technical Notes

• No user-facing changes - all commands work identically
• Total line reduction: ~12% across migrated commands
• Improved null safety and type handling