Able to add repeated tags

[youdonnnn]

I am able to add the tag "hr" even though in the tag list, there already exists a tag "HR". This might be confusing for users if they forgot that they already added the previous tag.

It might be better to make tags case-insensitive.

[nus-se-script]

Team's Response

We mentioned this in our planned enhancement section.

Items for the Tester to Verify

❓ Issue response

Team chose [response.Rejected]

• I disagree

Reason for disagreement: [replace this with your explanation]

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