Question: private void clean() cleans the expression, cleaning up the provided string by putting a single space between adjacent tokens, and no leading or trailing spaces.

private void clean() cleans the expression, cleaning up the provided string by putting a single space between adjacent tokens, and no leading or trailing spaces. So, for example, if the parameter is " 3+4* 83 / 6 ", it should be stored as "3 + 4 * 83 / 6". The only reason this method exists is to help the constructor. That's why it is private

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