Converted code to kotlin

kotlin/build.gradle

@@ -0,0 +1,31 @@
+plugins {
+    id 'java'
+    id 'org.jetbrains.kotlin.jvm' version '1.3.50'
+}
+
+group 'com.kata'
+version '1.0-SNAPSHOT'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.3.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.3.1'
+    testCompile("org.junit.jupiter:junit-jupiter-params:5.4.2")
+}
+
+test {
+    useJUnitPlatform()
+}
+
+compileKotlin {
+    kotlinOptions.jvmTarget = "1.8"
+}
+compileTestKotlin {
+    kotlinOptions.jvmTarget = "1.8"
+}