Checkpoint: the player lifecycle

Challenge on lesson: Checkpoint: the player lifecycle

CHALLENGE

Difficulty: advanced+25 XP

Implement Player: constructor takes starting HP (position starts at 0). move(steps) advances position (works at any HP). hit(dmg) reduces HP but **never below 0**, and does nothing when HP is already 0. heal(amount) raises HP but does nothing when HP is 0 (the player is out). getHp() and getX() report state.

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