/tmp/ccaAjz5c.o: In function `main':
advisor_grader.cpp:(.text.startup+0xbd): undefined reference to `ComputeAdvice(int*, int, int, int)'
/tmp/ccihVehX.o: In function `Assist(unsigned char*, int, int, int)':
advisor.cpp:(.text+0x275): undefined reference to `GetRequest()'
advisor.cpp:(.text+0x42e): undefined reference to `PutBack(int)'
collect2: error: ld returned 1 exit status
/tmp/ccyBiNWL.o: In function `main':
assistant_grader.cpp:(.text.startup+0x1ed): undefined reference to `Assist(unsigned char*, int, int, int)'
/tmp/ccoCBL4A.o: In function `ComputeAdvice(int*, int, int, int)':
assistant.cpp:(.text+0x8a): undefined reference to `WriteAdvice(unsigned char)'
assistant.cpp:(.text+0xa9): undefined reference to `WriteAdvice(unsigned char)'
collect2: error: ld returned 1 exit status