Compare Complete or Partial Hands

Implement a hand comparison engine for a simplified poker-like card game.

Each player has a hand represented by an array of card strings. A card is encoded as <rank><suit>, where rank is one of 2-10, J, Q, K, A, and suit is one of S, H, D, C.

Part 1: Compare complete hands

If both players have exactly 5 cards, return one of:

• "user1" if player 1 wins
• "user2" if player 2 wins
• "tie" if the hands are exactly equal in strength

Use the following hand rankings from strongest to weakest:

1. Four of a kind
2. Full house
3. Three of a kind
4. Two pair
5. One pair
6. High card

Tie-breaking rules:

• Four of a kind: compare the rank of the four matching cards, then the kicker.
• Full house: compare the rank of the triple, then the pair.
• Three of a kind: compare the rank of the triple, then the remaining two cards in descending order.
• Two pair: compare the higher pair, then the lower pair, then the kicker.
• One pair: compare the pair rank, then the remaining three cards in descending order.
• High card: compare all five ranks in descending order.

Assume suits do not affect hand strength.

Part 2: Compare partial hands

Because of network delay, a player may have fewer than 5 received cards. In this case, determine whether the result is already forced.

Return:

• "user1" if player 1 wins for every valid completion of the missing cards
• "user2" if player 2 wins for every valid completion of the missing cards
• "tie" if every valid completion ends in a tie
• "unknown" otherwise

For this follow-up, assume:

• Each final hand must contain exactly 5 distinct cards.
• Missing cards can be any distinct cards from the remaining standard 52-card deck.
• No card may appear twice across the final 10 cards.

Design the comparison logic cleanly so that ranking rules are modular and easy to extend.