[Checker] Define objects of containers.
[Checker] Add new functions:

- print_true_message()
- print_false_message()
[Checker] Add a new function: is_container_existed()
[Checker] Fix wrong argument.
[Checker] Add a new function: check_container_exist()
[Checker] Use dictionary of Python.
[Checker] Use cehck_container_exist() function.