#define Trouble?

Using Arduino Programming Questions
#1

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.

#2

Please help me solving me this error.

First, read and follow the instructions in the "How to use this forum" post.

But it is best to start your own thread. Ask the moderators to split off this post.

#3