Add Kotlin support

[evgenyigumnov]

1. Create folder "kotlin"
2. Create copies of "prompt.txt" in the "kotlin" folder

Launch example

rustsn --lang=kotlin

Example query:

take 2 params and add them and return result

Example generation:

build.gradle.kts

plugins {
    kotlin("jvm") version "1.8.0"
    application
}

group = "com.example"
version = "1.0.0"

repositories {
    mavenCentral()
}

dependencies {
    testImplementation(kotlin("test"))
}

application {
    mainClass.set("com.example.SolutionKt")
}

tasks.test {
    useJUnitPlatform()
}

src/main/kotlin/com/example/Solution.kt

fun solution(a: Any, b: Any): Any {
    return when {
        a is Int && b is Int -> a + b
        a is String && b is Int -> a + b.toString()
        else -> throw IllegalArgumentException("Unsupported parameter types")
    }
}

fun main() {
    println(solution(1, 2))        // Outputs: 3
    println(solution(-1, -2))      // Outputs: -3
    println(solution("1", 2))      // Outputs: 12
}

src/test/kotlin/com/example/SolutionTest.kt

import kotlin.test.Test
import kotlin.test.assertEquals
import kotlin.test.assertFailsWith

class SolutionTest {

    @Test
    fun test1() {
        assertEquals(3, solution(1, 2))
    }

    @Test
    fun test2() {
        assertEquals(-3, solution(-1, -2))
    }

    @Test
    fun test3() {
        assertEquals("12", solution("1", 2))
    }

    @Test
    fun testInvalidParams() {
        assertFailsWith<IllegalArgumentException> {
            solution(1.0, 2.0)
        }
    }
}

Example install dependencies

./gradlew build

Example launch compilation

./gradlew build

Example launch tests

./gradlew test