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Challenge: Basic String Manipulation

Explore writing unit tests and implementing Java methods for string manipulation tasks. Understand how to apply TDD principles by creating tests for counting characters, converting strings to lowercase, and counting specific character occurrences before coding the solution.

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Task and requirements

You’re given a string containing a sentence. Your task is to create a Java program that performs the following operations:

  1. Count the total number of characters in the sentence, excluding spaces.

  2. Convert the sentence ...