iOS C++ 64 Bit Fixing

I have an app developed by a Chinese Developer. The app retrieves the Contacts List to an SQLite Database and then you select people to send bulk SMS from Message App. The App uses a C++ Array and Search Algorithm to speed up search in Contacts List, however it does not work on 64Bit iPhones, despite it works well in previous iphones. I want you to fix C++ and Neccessary Objective-C files in order to smoothly Run the App in 64Bit iPhone 5s and both previous iPhones. You need to have Solid C++ experience in 64Bit Architectures and must know Long and Unsigned Smal types in 64Bit environment and as well as Objective C experience No Middle Man or Company.