Update Stack.java

[Swarali-31]

Here's a code for a singly linkedlist. It's my first time contributing to an opensource for hacktoberfest.Apologies for any mistakes! Gonna make it better the next time! :)

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] All new code is formatted with clang-format -i --style=file path/to/your/file.java

[Swarali-31]

It's already implemented here

https://github.com/TheAlgorithms/Java/blob/4a03f420616a6773e9a5cdc304b1681e96d945bd/src/main/java/com/thealgorithms/datastructures/stacks/StackOfLinkedList.java#L50

Ohkay!

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