private boolean emitPercent(String formatString, int i) {
		if (formatString.charAt(i) == '%' && i + 1 < formatString.length() &&
			formatString.charAt(i + 1) == '%') {
			return true;
		}
		return false;
	}
Skips a series of numbers (field width or precision) within a format String.
returns the index of the format String at the last digit before another
non-digit character

@param formatString format String
@param i      index into formatStr
@return new index into formatString
Ghidra/Features/DecompilerDependent/src/main/java/ghidra/app/plugin/core/string/variadic/FormatStringParser.java