Wordle: Implement the Core Game Logic for a Wordle Word-Guessing Game

Question

## Round 1 - Coding

## Problem

Implement the core logic of Wordle. The player has 6 attempts to guess a 5-letter secret word. After each guess, each letter is marked: correct position (green/`G`), wrong position (yellow/`Y`), or not in word (gray/`X`).

```python
class Wordle:
    def __init__(self, secret: str):
        ...
    def guess(self, word: str) -> str:
        # returns 5-char string: "G", "Y", or "X" per letter
        # raises ValueError if word is not 5 letters
        # raises GameOverError if already won or out of guesses
        ...
    def is_won(self) -> bool:
        ...
    def attempts_left(self) -> int:
        ...
```

## Example

```
game = Wordle("crane")
game.guess("slate")  -> "XXYXY"  # s=X,l=X,a=Y,t=X,e=Y
game.guess("trace")  -> "YGGGY"  # t=Y,r=G,a=G,c=G,e=Y
game.guess("crane")  -> "GGGGG"
game.is_won()        -> True
game.attempts_left() -> 3
```

## Follow-ups

1. How do you handle duplicate letters correctly — e.g., secret is `"crane"` and guess is `"erred"`? Walk through the marking logic.
2. How would you build a solver that narrows the candidate word list using feedback from each guess?
3. How do you validate that a guess is a real English word (not just any 5-letter string)?
4. How would you extend this to a multiplayer version where all players guess the same daily word?

Wordle: Implement the Core Game Logic for a Wordle Word-Guessing Game

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