new java.io.File(outputDirectory).mkdirs
val outConf = Paths.get(outputDirectory, "other.conf")
Files.write(outConf, config.root().render(ConfigRenderOptions.concise()).getBytes)

"app" : {
    "message" : {
        "name" : "messanger",
        "lenght" : 100
     }
    "text" : {
         "font" : 10
     }
 }

app.message.name = "messanger"
app.message.length = 100
app.text.font = 10