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It is sometimes tricky working with linked lists if you are searching for an item to delete it.

It is important sometimes to check a string and make sure that it does contain a white space (e.g. space, new line, tab, etc ...).

It is sometimes not practical to work out a string object immediately before validating if it is null or not

You may want to present a number and make it callable.

When you start coding, you need to be mindful to memory usage and leakage.