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BJP5 Exercise 4.17: stutter

Language/Type: Java String return
Author: Marty Stepp (added by Melissa Galloway on 2019/09/19)

Write a method called stutter that accepts a parameter and returns the String with its characters returns repeated twice. For example, stutter("Hello!") returns "HHeelllloo!!"

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This is a method problem. Write a Java method as described. Do not write a complete program or class; just the method(s) above.

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