Convert Dictionary to string in swift4 iOS

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Solution:
  do {
                
        let theJSONData = try JSONSerialization.data(
                            withJSONObject: dic ,
                            options: JSONSerialization.WritingOptions(rawValue: 0))
                        let theJSONText = NSString(data: theJSONData,
                                                   encoding: String.Encoding.ascii.rawValue)
                       let str = String(describing: theJSONText)

                    } catch let error as NSError {
                        // handle error
                    }

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