i cleaned up the repo

and tried to write a new makefile but coudnt get it to include the gtest library.

Fehlermeldung:

g++    -c -o src/Fibonacci.o src/Fibonacci.cpp
src/Fibonacci.cpp:4:25: fatal error: gtest/gtest.h: No such file or directory
 #include "gtest/gtest.h"
                         ^
compilation terminated.