C++ Please!!

Implement the following functions. The declarations are in functions.h. Your definitions should go in functions.cpp. main.cpp has testing code in it. functions.cpp /usr/bin/ld: /tmp/ccc4HrTg.0: in function 'main': /usr/bin/ld: /tmp/cc49Xrkf.0: in function 'main': /tmp/codecheck/work5frsJV04yAdBw4274ivR/submissionrun/main.cpp:15: undefined reference to 'fill(int*, unsigned int)' /usr/bin/ld: /tmp/codecheck/work5frsJV04yAdBw4274ivR/submissionrun/main.cpp:20: undefined reference to 'dogAge(int)' /usr/bin/ld: /tmp/codecheck/work5frsJV04yAdBw4274ivR/submissionrun/main.cpp:33: undefined reference to 'animalYears (int, int\&, int\&)' collect2: error: ld returned 1 exit status Score