#define Trouble?

Arduino: 1.8.9 (Windows 7), Board: "Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)"

ecc_test:5:15: error: expected unqualified-id before string constant

static int RNG(uint8_t *dest, unsigned size) {

^

exit status 1
expected unqualified-id before string constant

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

I am getting this error.
I am new to arduino and its coding style.
Please help me solving me this error.

Please help me solving me this error.

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