[PE-D][Tester A] Email can be added without root domain extension

[nus-pe-bot]

To replicate:

/add-supplier ; name : PetCo ; phone : 98673098 ; address : Meow Street 24 ; email : ilovewombatstoo@gmail ; product : kibble ; price : $98/bag

Suggestion:

Validate the email with the presence of a "." after the "@"

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Labels: type.FeatureFlaw severity.Low original: belligerentbeagle/ped#9

[yleeyilin]

We purposefully accepted emails with no root extension since there exists emails without these root extensions. You can refer to the following link for email examples:

https://en.wikipedia.org/wiki/Email_address#Examples