Likely duplicates allowed within the same wedding

[FooNicholas]

Same information for most fields, and only differ by extra whitespace.

To replicate:

Step 1: Open any pre-existing wedding using open command e.g. open 3

Step 2: Enter command: add n/Harry Kane p/13701978 e/kane@example.com a/789 NUS Rd t/bridesmaid

Step 3: Enter command: add n/Harry Kane p/13701978 e/kane@example.com a/789 NUS Rd t/bridesmaid