format not keeping the input order

executing the data

`[
    {
        "calling": "332123456788",
        "called": "9876545433",
        "sk": "999"
    }
]`

Give the output:

`{
  "stdout": "",
  "result": "sk,called,calling
999,9876545433,332123456788
",
  "stderr": "",
  "exit_code": 0
}`

Also, it is inserting a new line character in the end