public char peek(int lookAhead) {
		try {
			return string.charAt(index + lookAhead);
		}
		catch (IndexOutOfBoundsException e) {
			return DONE;
		}
	}
Peeks at the character current index + lookAhead.
Returns DONE if the computed position is out of range.
@param lookAhead number of characters to look ahead
@return the character at index+lookAhead
Ghidra/Features/MicrosoftDmang/src/main/java/mdemangler/MDCharacterIterator.java