Add itinerary tickets code

[Imbiber]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.

[siriak]

Could you please add some JUnit tests? (see https://github.com/TheAlgorithms/Java/tree/master/src/test/java/com/thealgorithms)

[siriak]

The code looks good. Please fix PR check https://github.com/TheAlgorithms/Java/actions/runs/6054455394/job/16431883329?pr=4340
There is some excessive whitespace

[vil02]

In general code looks good - no need for some big changes. Here are my small suggestions (some of them will fix the CI errors). You probably know its - It is enough to click Commit suggestion button.

[Imbiber]

In general code looks good - no need for some big changes. Here are my small suggestions (some of them will fix the CI errors). You probably know its - It is enough to click Commit suggestion button.

@vil02 can you help me out. I tried, but failed to correct the error last time , you providing me changes has given me hope.
It still failed Clang format linter / build (pull_request) . How to solve it?

[vil02]

@Imbiber regarding clang-format, please have a look at: #4438 (comment)

It seems that you need to change the order of the imports (cf. log) - this can be done by hand.

[vil02]

What do you think about such renaming?

Suggested change

	for (String key : tickets.keySet()) {
	revTickets.put(tickets.get(key), key);
	}
	for (String key : tickets.keySet()) {
	if (!revTickets.containsKey(key)) {
	return key; // Starting point
	}
	for (final var startStation : tickets.keySet()) {
	revTickets.put(tickets.get(startStation), startStation);
	}
	for (final var startStation : tickets.keySet()) {
	if (!revTickets.containsKey(startStation)) {
	return startStation; // Starting point
	}

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contribution!

[github-actions]

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