Add checks to new item input

[etiry]

Description

Adds checks to user input of new items to alert the user if they submitted an empty item name or submitted an item that is already on their list after normalizing case and punctuation

Related Issue

closes #10

Acceptance Criteria

• Show an error message if the user tries to submit an empty item
• Show an error message if the user tries to submit a new item that is identical to an existing name. For instance, if the list contains apples and the user adds apples.
• Show an error message if the user tries to submit a new item that matches an existing name with punctuation and casing normalized. For instance, if the list contains apples and the user adds aPples or apples, or a pples.
• The user’s original input is saved in the database

Type of Changes

enhancement

Updates

Before

N/A

After

3c18)

Testing Steps / QA Criteria

• Sign in and select the dinner list
• Navigate to the Manage List view
• Try to submit the form without entering an item name
• Confirm that an alert displays saying "Please enter an item name"
• Try to add an item that is already on the list by entering it identically (e.g., Gruyere not gruyere)
• Confirm that an alert displays saying "This item already exists in the list"
• Try to add an item that is already on the list by changing the casing and/or adding punctuation or spaces (e.g., gruyere or Gruyere!)
• Confirm that an alert displays saying "This item already exists in the list"
• Try to add an item that is not on the list
• Confirm it gets added successfully
• Confirm it gets added as you typed it in rather than a normalized version (e.g., Oreos not oreos)

[github-actions]

Visit the preview URL for this PR (updated for commit 1e301b2):

https://tcl-68-smart-shopping-list--pr30-et-ap-check-item-emp-xryu1k3k.web.app

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[sdmisra]

This looks good to me, nice work this week!

[raaynaldo]

Great job on utilizing regex

[DevinaG007]

Praise: Nice comparison choice used on line 36 of ManageList. I tested "New England Clam Chowder" versus "Clam Chowder" and it worked!

[raaynaldo]

Thanks!