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kotlinlang

Hi,

I wrote the following line:

```
val command = """{"type":"Modify", "content":{"levels": { "$identifier": {"$propertyName":"$value"}}}}"""
```

This is obviously very bad code as any of the variables can easily break JSON. What would be "kotlin-way"? I'm looking for some concise solution. :slightly_smiling_face: Thanks 

PS: I use Kotlin 1.1.4

```fun String.escape() = this.replace('\t', "\\t").replace('\n',"\\n")...```, see this for everything you need to replace: <https://www.freeformatter.com/json-escape.html>

and then ```val command = {"type":"Modify", "content":{"levels": { "${identifier.escape()}": {"${propertyName.escape()}":"${value.escape()}"}}}}```

Altrough a better solution would be to use an actual Json library.