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The code should always be written in a **reusable** and **object oriented** manner. It should not be written to just satisfy one time need. It should be properly designed. Every method should should provide one functionality. Give some time to think about the contract _(the input parameters it takes & what it returns)_ of the method given the functionality it provides.
For example for question1 one approach could be to make a class named `StringUtils` with a method named `removeRepeatedChars`. Then instead of creating a main function and testing anything, one should always write multiple unit tests to test every possible expect.