The case still have assertion error,

words $=$ re$.$findall$($r$\text{'}\backslash$w$+\text{'},$ content$)$ # Use regex to find all words

modified$\_$words $=[$word$.$capitalize$()$ for word in re$.$findall$($r$\text{'}\backslash$b$\backslash$w$+\backslash$b$\text{'},$ content$)]$ # Capitalize each word

modified$\_$string $=\text{'}\text{'}.$join$($modified$\_$words$)$ # Join modified words back to a string

Attched please find the test case, the text is in one line, not a paragraph.