problem3 replace Write a method that accepts a String as a parameter and returns a String where every appearance of the lowercase word "are" has been replaced with "are not". The word "are" should not be immediately preceded or followed by a letter -- so for example the "are" in "care" or "scared" does not count. (Note: Character.isLetter (char) tests if a char is a letter.) Examples: problem3_replace ("are test"); // returns "are not tests" problem3_replace ("are-are"); // returns "are not-are not" problem3_replace ("These are right"); // returns "These are not right" problem3_replace ("I love Java!"); // returns "I love Java!" problem3_replace ("My favorite numbers are3 and 5."); // returns "My favorite numbers are not3 and 5." problem3_replace ("I dare you"); // returns "I dare you"

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The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.