You are right, this is clearly a bug in the t_shooter_player.h.

In line 24 there is written: #include "t_shooter_player.c"

This is wrong, it must be: #include <t_shooter_player.c>

For including files from the include folder, they must be in <> and not in "".

You should report this bug, it is a clear bug in my opinion, report it to George on the AUM forum. The shooter template is from George's AUM.