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I may have went a little overboard, but the main point is the deep copy of 'char* s' to 'char* Person::buffer' ( lines 140 - 150 ) as well as how the serialization should be. ( lines 172 - 181 ).
To perform the deep copy, you need to either do what I did and allocate on the heap with operator new[] or store a c-style array of 'char buffer[ string_length_max + 1 ] in Person. If you choose the operator new[] route like I did, then you also need to call operator delete[] for each Person objects' buffer. This is why there is now a constructor and destructor. in Person.
The Database class is just a storage and interface class for the Person object list. I think it tidies up the main code a bit.