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Sprint

In Age of Dragons, humans can "sprint" to move twice as fast. However, sprinting requires __stamina. Each time a human sprints, it loses stamina. Once it is out of stamina, it can no longer sprint.

Assignment

Complete all the missing methods:

Complete the private helper methods, which are intended to be used by the other four sprinting methods.
1. __raise_if_cannot_sprint(): Raise the exception: not enough stamina to sprint if the human is out of stamina.
2. __use_sprint_stamina(): Remove one stamina from the human.
For each of the sprint methods:
1. Call __raise_if_cannot_sprint() to raise an exception if the human is out of stamina.
2. Use __use_sprint_stamina() once to use the stamina needed to sprint.
3. Move twice in the direction of the sprint.