Merge individual changes to src/api/groups.js from project 1

[evelynnchen-cmu]

Description

Merging individual changes from Project 1 into team repository.

Reduced the cognitive complexity of the groupsAPI.join function in src/api/groups.js by extracting logic into two helper functions.

UI Test

1. Register a new user
2. Log out of new user's account
3. Log in as admin user
4. Navigate to localhost:4567/groups
5. Create a new group by clicking the blue "Create New Group" button
6. Click "Members" on the left-hand side of the main content and click the blue "Add Member" button
7. Search for the username of the user created in Step 1 and then click "Add Member"

Test Coverage

[coveralls]

Pull Request Test Coverage Report for Build 10973849287

Details

• 9 of 9 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 82.683%

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Totals
Change from base Build 10841145095:	0.02%
Covered Lines:	22330
Relevant Lines:	25586

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💛 - Coveralls