add AccountUtil.kt

- AccountEntity toResponse
- Account Request toEntity

src/main/kotlin/ltd/lulz/util/AccountUtil.kt

@@ -0,0 +1,18 @@
+package ltd.lulz.util
+
+import java.math.RoundingMode.DOWN
+import ltd.lulz.model.Account
+import ltd.lulz.model.AccountEntity
+import org.springframework.http.HttpStatus.INTERNAL_SERVER_ERROR
+import org.springframework.web.server.ResponseStatusException
+
+fun Account.Request.toEntity(): AccountEntity = AccountEntity(
+    name = name,
+    amount = amount.setScale(2, DOWN),
+)
+
+fun AccountEntity.toResponse(): Account.Response = Account.Response(
+    id = id ?: throw ResponseStatusException(INTERNAL_SERVER_ERROR),
+    name = name,
+    amount = amount,
+)