Implement WordGuess feedback scoring

WordGuess (Wordle-like) scoring

Implement a function that scores a guess against a secret word of the same length.

Scoring rules (per character)

Return an integer array result of length n (where n = secret.length = guess.length):

• GREEN = 2: guess[i] == secret[i] (exact match)
• YELLOW = 1: guess[i] != secret[i], but guess[i] occurs elsewhere in secret and there is still unmatched availability of that character after accounting for GREEN matches and other YELLOW assignments (i.e., respect letter multiplicity).
• GRAY = 0: the character does not occur in secret (or all occurrences are already consumed by GREEN/YELLOW matches).

This is the same matching behavior used by Wordle: GREEN matches are applied first; then YELLOWs are assigned based on remaining character counts in the secret.

Input validation

Throw an exception (or return an error) if any of the following are true:

• secret or guess is null/empty
• lengths differ
• inputs contain invalid characters (define and enforce a rule, e.g., only lowercase English letters a-z)

Examples

1. secret = "hello", guess = "abcde" → result = [0,0,0,0,1] (e exists in secret but not at the same position)

2. secret = "hello", guess = "eabcd" → result = [1,0,0,0,0]

3. Duplicate-letter behavior: secret = "aabb", guess = "bbba" → result = [1,2,0,1] Explanation: index1 is GREEN (b), remaining secret letters have one b and two a available, so only one of the remaining bs can be YELLOW.

What to implement

Write the core scoring function (you do not need to build a full interactive game loop unless explicitly asked).

• Input: secret: string, guess: string
• Output: int[] result (values in {0,1,2})