FunctionProcessor.kt

override fun visitClassDeclaration(classDeclaration: KSClassDeclaration, data: Unit) {
    ...
    
    // Getting the list of member properties of the annotated interface.
    val properties: Sequence<KSPropertyDeclaration> = classDeclaration.getAllProperties()
        .filter { it.validate() }

    // Generating function signature.
    file += "\n"
    if (properties.iterator().hasNext()) {
        file += "fun $functionName(\n"

        // Iterating through each property to translate them to function arguments.
        properties.forEach { prop ->
            visitPropertyDeclaration(prop, Unit)
        }
        file += ") {\n"

    } else {
        // Otherwise, generating function with no args.
        file += "fun $functionName() {\n"
    }

    // Generating function body
    file += "    println(\"Hello from $functionName\")\n"
    file += "}\n"
}