Dictionary Comprehension — Word Frequency

Implement solve(text) that returns a dictionary mapping each unique word (lowercased) to the number of times it appears in the text.

• Split on whitespace only.
• Lowercase all words before counting.
• Punctuation attached to words should be stripped (only .,!?;: at start/end of each word).

Examples

• solve("Hello hello HELLO") → {"hello": 3}
• solve("the cat sat on the mat") → {"the": 2, "cat": 1, "sat": 1, "on": 1, "mat": 1}
• solve("") → {}