Add internal project for test

build.gradle.kts

@@ -108,6 +108,7 @@ spotless {
 val r8: Configuration by configurations.creating
 
 dependencies {
+  implementation(project(":internal"))
   implementation("org.apache.poi:poi:5.2.5")
   implementation("org.jdom:jdom2:2.0.6.1")
 

internal/build.gradle.kts

@@ -0,0 +1,7 @@
+plugins {
+  kotlin("jvm")
+}
+
+java {
+  toolchain.languageVersion = JavaLanguageVersion.of(18)
+}

internal/src/main/kotlin/io/github/goooler/internal/InternalLogger.kt

@@ -0,0 +1,12 @@
+package io.github.goooler.internal
+
+import java.util.logging.LogManager
+import java.util.logging.Logger
+
+object InternalLogger {
+  private val logger: Logger = LogManager.getLogManager().getLogger("internal")
+
+  fun info(message: String) {
+    logger.info(message)
+  }
+}

settings.gradle.kts

@@ -29,3 +29,5 @@ dependencyResolutionManagement {
 }
 
 enableFeaturePreview("STABLE_CONFIGURATION_CACHE")
+
+include(":internal")

src/main/kotlin/io/github/goooler/exporter/Main.kt

@@ -1,7 +1,6 @@
 package io.github.goooler.exporter
 
-import org.apache.logging.log4j.LogManager
-import org.apache.logging.log4j.Logger
+import io.github.goooler.internal.InternalLogger
 
 fun main(vararg args: String) {
   val (command, inputPath, outputPath) = args
@@ -12,6 +11,6 @@ fun main(vararg args: String) {
   }
 }
 
-val logger: Logger = LogManager.getLogger("Main")
+val logger = InternalLogger
 
 const val SUCCESS_OUTPUT = "Convert finished, output path:"