Go application that exposes REST API for storing and retrieving synonyms. Uses simple in-memory map structure for storing synonyms.

Implement a set of basic HTTP endpoint handlers. The complete system should act as a thesaurus - it should enable users to store and fetch sets of synonyms. Please also consider testability, readability, algorithmic complexity, and maintainability!

Your implementation should fulfil the following requirements:

• Endpoint to add new sets of synonyms. For example, adding a pair of synonyms such as “begin” and “start”.
• Endpoint to search for synonyms. In the above example, searching for either “begin” or “start” should return the respective synonym (symmetrical relationship).
• A word may have multiple synonyms, and all should be returned at a user request.
• The solution needs to support concurrent requests in a thread-safe way.
• Make the solution with simple data structures in memory - no persistence/database needed.
• Bonus*: Implement a transitive rule. For example, if “A” is added as a synonym for “B”, and “B” is added as a synonym for “C”, then searching the word “C” should return both “B” and “A”.

• Go 1.20 or Docker

• Run on default port (8080): make run

• Run on specific port (9090): make run-port port=9090

• Build image: make docker-build
• Run container: make docker-run

• Add A and B pair:

curl -X POST -H "Content-Type: application/json" -d '{ "synonyms": ["A", "B"] }' https://localhost:8080/api/v1/synonym

• Add B and C pair:

curl -X POST -H "Content-Type: application/json" -d '{ "synonyms": ["B", "C"] }' https://localhost:8080/api/v1/synonym

• Retrieve synonyms for A:

curl https://localhost:8080/api/v1/synonym?word=A

• Retrieve synonyms for C:

curl https://localhost:8080/api/v1/synonym?word=C