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fun mapToString(map: Map<String, String>): String {
    val arrayOfMapEntries = map.entries.map { entry ->
        entry.key + "=" + entry.value
    }
    return arrayOfMapEntries.joinToString(",")
}

fun stringToMap(s: String): Map<String, String> {
    val map = s.split(",").associate {
        val (left, right) = it.split("=")
        left to right
    }
    return map
}