Implemented the attribute operator, using a period

tests/units/test_attribute.c

@@ -0,0 +1,9 @@
+#include "toy_console_colors.h"
+
+#include <stdio.h>
+#include <string.h>
+
+int main(void) {
+	printf(TOY_CC_WARN "Test not yet implemented: %s\n" TOY_CC_RESET, __FILE__);
+	return 0;
+}