Minor issue. Editing a person such that the name is already used gives this error message: "This student already exists in the address book." Might be better to say something like "Name is already in the address book" because having 2 separate contacts originally and changing the person's name sort of imply that they are different students, which may make the error message inaccurate (since error message assumes they are the same person)

steps to reproduce: have 2 person in the contactlist and try renaming one to another (as shown in the picture)
Minor issue. Editing a person such that the name is already used gives this error message: "This student already exists in the address book." Might be better to say something like "Name is already in the address book" because having 2 separate contacts originally and changing the person's name sort of imply that they are different students, which may make the error message inaccurate (since error message assumes they are the same person)
steps to reproduce: have 2 person in the contactlist and try renaming one to another (as shown in the picture)