fixed tests makefile

tests/Makefile

@@ -8,12 +8,13 @@ OBJ_FILES := $(addprefix ./,$(notdir $(CPP_FILES:.cpp=.o)))
     
 tests: $(OBJ_FILES)    
 	$(CXX) $(CXXFLAGS) $(LDPFALGS) -o $@ $^
+	mkdir -p logs
 
 %.o: %.cpp
 	$(CXX) $(CXXFLAGS) -c -o $@ $<
 
 clean:
-	rm -f tests *.o logs/*     
+	rm -f tests *.o logs/*.txt     
  
 rebuild: clean tests