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       RAND_cleanup - erase the PRNG state
        #include <openssl/rand.h>
        void RAND_cleanup(void);
       RAND_cleanup() erases the memory used by the PRNG.
       RAND_cleanup() returns no value.
       rand(3)
       RAND_cleanup() is available in all versions of SSLeay and OpenSSL.
1.0.2t                            2019-09-10                   RAND_cleanup(3)