Returns undefined | "FIRSTCARD_IS_COLOR_OR_NUMBER_IS_SAME" | "FIRSTCARD_IS_WILD_OR_WILD4_IS_SAME_SECOND_COLOR" | "SECONDCARD_IS_VALIDSPECIAL_AND_SAME_COLOR_AS_FIRSTCARD" | "FIRSTCARD_IS_NTYPE_AND_SECONDCARD_IS_NTYPE_TOO" | "SECONDCARD_IS_WILD" | "SECONDCARD_IS_WILD4"
An enum that indicate a certain valid condition
A function that used to defining the state for switch case comparer