All but the last exercises complete as an error is thrown when trying to set the height.

Added category to NSString and implemented new method within main implementation.

Exercises

Add a category to the XYZPerson class to declare and implement additional behavior, such as displaying a person’s name in different ways.

Add a category to NSString in order to add a method to return the uppercase version of a string.

Add two readonly properties to the original XYZPerson class implementation to represent a person’s height and weight, along with methods to measureWeight and measureHeight.
Use a class extension to redeclare the properties as readwrite, and implement the methods to set the properties to suitable values.