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get-output-stream-string  string-output-stream ⇒  string
string-output-stream—a stream.
string—a string.
Returns a string containing, in order, all the characters that have been output to string-output-stream. This operation clears any characters on string-output-stream, so the string contains only those characters which have been output since the last call to get-output-stream-string or since the creation of the string-output-stream, whichever occurred most recently.
 (setq a-stream (make-string-output-stream)
        a-string "abcdefghijklm") ⇒  "abcdefghijklm"
 (write-string a-string a-stream) ⇒  "abcdefghijklm"
 (get-output-stream-string a-stream) ⇒  "abcdefghijklm"
 (get-output-stream-string a-stream) ⇒  ""
The string-output-stream is cleared.
The consequences are undefined if stream-output-string is closed.
The consequences are undefined if string-output-stream is a stream that was not produced by make-string-output-stream.
The consequences are undefined if string-output-stream was created implicitly by with-output-to-string or format.