Refactoring in an OOP App

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Problem

Build an OOP app where each stage builds on the last, requiring refactors and careful design.

Implement build_reports(documents) using composable stages for normalization, tokenization, and word-frequency reporting. Each stage must expose a consistent processing interface, and the pipeline must pass one stage's output directly to the next without embedding stage-specific logic.

Input is a list of strings. Return one report per input string, where each report contains the token list and a frequency dictionary. Preserve token order and treat words case-insensitively after trimming and collapsing whitespace.

Constraints

0 <= len(documents) <= 500
0 <= len(documents[i]) <= 1000
Documents contain arbitrary whitespace and non-whitespace text
Tokens are separated by whitespace only
The output contains one report for every input document

Function Signature

def build_reports(documents):

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