Migrate code to Kotlin

build.gradle.kts

@@ -1,9 +1,10 @@
 plugins {
     id("java")
+    kotlin("jvm") version "1.5.31"
     id("application")
     id("com.github.johnrengelman.shadow") version "7.0.0"
-    id("checkstyle")
     id("com.github.vlsi.gradle-extensions") version "1.74"
+    id("com.github.autostyle") version "3.1"
 }
 
 group = "com.github.vlsi.ksar"
@@ -43,6 +44,31 @@ tasks.withType<Test>().configureEach {
     useJUnitPlatform()
 }
 
+autostyle {
+    kotlinGradle {
+        ktlint("0.40.0") {
+            userData(mapOf("disabled_rules" to "no-wildcard-imports,import-ordering"))
+        }
+        trimTrailingWhitespace()
+        endWithNewline()
+    }
+}
+plugins.withId("org.jetbrains.kotlin.jvm") {
+    autostyle {
+        kotlin {
+            trimTrailingWhitespace()
+            // Generated build/generated-sources/licenses/com/github/vlsi/gradle/license/api/License.kt
+            // has wrong indentation, and it is not clear how to exclude it
+            ktlint("0.40.0") {
+                userData(mapOf("disabled_rules" to "no-wildcard-imports,import-ordering"))
+            }
+            // It prints errors regarding build/generated-sources/licenses/com/github/vlsi/gradle/license/api/License.kt
+            // so comment it for now :(
+            endWithNewline()
+        }
+    }
+}
+
 val writeVersion by tasks.registering {
     val outDir = project.layout.buildDirectory.dir("generated/version")
     val versionText = version.toString()
@@ -58,10 +84,6 @@ val writeVersion by tasks.registering {
 
 sourceSets.main.get().resources.srcDir(writeVersion)
 
-checkstyle {
-    config = project.resources.text.fromFile("src/main/checkstyle/ksar-checks.xml", "UTF-8")
-}
-
 tasks.jar {
     manifest {
         attributes(