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Stutter

Language/Type: C# List Collections stutter
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Write a method stutter that takes a List of strings as a parameter and that replaces every string with two of that string. For example, if the list stores the values {"how", "are", "you?"} before the method is called, it should store the values {"how", "how", "are", "are", "you?", "you?"} after the method finishes executing.

Method: Write a C# method as described, not a complete program or class.

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