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in the cmakelists.txt, just deleted src/overlapping_rect.cpp

before: add_executable(roc_choice src/roc_choice.cpp src/abstract_choice.cpp src/my_exception.cpp src/overlapping_rect.cpp)

after: add_executable(roc_choice src/roc_choice.cpp src/abstract_choice.cpp src/my_exception.cpp)

because overlapping_rect.cpp also contains a main function.

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