feat: add functions for word and character counting

[NeiltonSeguins]

Add functions for counting words and characters in a more organized way.

Changes Made:

• Introduce two separate functions, countWords and countCharacters, for performing word and character count calculations.
• The functions handle whitespace properly, ensuring accurate counts.
• Update the existing code to use the new functions.

Motivation: These changes make the code more readable and reusable, while ensuring the correct counting of words and characters, excluding whitespace.