"The singleton pattern is a design pattern that restricts the instantiation of a class to one object. This is useful when exactly one object is needed to coordinate actions across the system."
- Wikipedia: Singleton Pattern

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Complete the Singleton class in your editor which contains the following components:

1. A private Singleton non parameterized constructor.
2. A public String instance variable named .
3. Write a static method named getSingleInstance that returns the single instance of the Singleton class.

Once submitted, our hidden Solution class will check your code by taking a String as input and then using your Singleton class to print a line.