/usr/bin/ld: /tmp/cc21GW0I.o: in function `assertion(bool, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
answer.code:(.text+0x30): multiple definition of `assertion(bool, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'; /tmp/cc6bC8KI.o:implementer.cpp:(.text+0x150): first defined here
/usr/bin/ld: /tmp/cc21GW0I.o: in function `count_pair(int, int, int)':
answer.code:(.text+0x70): multiple definition of `count_pair(int, int, int)'; /tmp/cc6bC8KI.o:implementer.cpp:(.text+0x170): first defined here
/usr/bin/ld: /tmp/cc21GW0I.o: in function `find_character(int, std::vector<int, std::allocator<int> >)':
answer.code:(.text+0x1c0): multiple definition of `find_character(int, std::vector<int, std::allocator<int> >)'; /tmp/cc6bC8KI.o:implementer.cpp:(.text+0x390): first defined here
/usr/bin/ld: /tmp/cc21GW0I.o: in function `main':
answer.code:(.text.startup+0x0): multiple definition of `main'; /tmp/cc6bC8KI.o:implementer.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status