First commit, fixed appending, create, destroy and get, all working fine

tests/CMakeLists.txt

@@ -0,0 +1,23 @@
+find_package(cmocka REQUIRED)
+
+add_executable(test_linkedlist
+    test_linkedlist.c
+)
+
+target_link_libraries(test_linkedlist
+    PRIVATE
+        linkedlist
+        cmocka
+)
+
+target_compile_options(test_linkedlist PRIVATE
+    -fsanitize=address
+)
+
+target_link_options(test_linkedlist PRIVATE
+    -fsanitize=address
+)
+
+add_test(NAME linkedlist_tests
+         COMMAND test_linkedlist)
+