message: remove unused findBuildingIndex
diff: @@ -4,8 +4,3 @@ export function findBuilding (town: Town, key: string) {
  console.log('Finding a building;', key)
  return town.buildings.find(building => building.key === key)
  }
  -
  -export function findBuildingIndex (town: Town, key: string) {
  - console.log('Finding index of a building;', key)
  - return town.buildings.findIndex(building => building.key === key)
  -}
  