Able to add duplicate persons in the addressbook

[tengcharmaine]

What i did: Tried adding contacts having all the same details including the name (just that i added spaces between the first and last name). The app identified it as different users. Users of this app might type fast and accidentally add a few spaces here and there and allowing this to happen might result in the user not being able to accurately find all the loans of a person at once/miss out loans.

[nus-pe-script]

Your response not required for this bug as the team has accepted the bug as it is.