Buffer overflow

[ai-and-i]

Hi, I think this line can cause buffer overflow:

Arduino-StaticSerialCommands/src/StaticSerialCommands.cpp

Line 73 in 35f192e

buffer[index] = '\0';

because index can equal to bufferSize after this:

Arduino-StaticSerialCommands/src/StaticSerialCommands.cpp

Lines 77 to 79 in 35f192e

	} else if (index < bufferSize) {
	buffer[index] = ch;
	index++;

I suggest to fix it by replacing else if (index < bufferSize) with else if (index < bufferSize - 1), ensuring that one byte is always left for the zero termination character.