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Fix CSV parsing to handle nested comma delimiter inside quotes by using Apache Commons CSV. #200

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This is a fix for issue #199

#199

This code fix replaces the custom CSV parsing done via string manipulation with the very flexible Apache Commons CSV project.

An additional unit test is added to validate the nested comma problem.

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if (delimiter.equals(",")) {
csvParser = CSVFormat.RFC4180.parse(new StringReader(dataStr));
} else {
csvParser = CSVFormat.TDF.withIgnoreSurroundingSpaces(false).parse(new StringReader(dataStr));
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delimiter is ignored in this case

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