Design a word counter for streaming text

Implement a WordCounter class to count word frequencies from streaming text. You will receive multiple chunks of text over time. Split each chunk into words and accumulate counts. Provide a query API to return the total count for a given word. Implement: add(text: str) -> None count(word: str) -> int (return 0 if absent) Constraints / defaults: Words are separated by whitespace (spaces/newlines/tabs). Case-sensitive. Input size: each chunk up to 1e5 characters; total up to 1e6. Provide 5 test cases covering casing, duplicates, empty input, multiple spaces, and newlines. Example Input add: "hello world hello"\ncount: "hello" Output 2