public void InitializeWalkState()

Calling this method more than once will throw an System.ArgumentException because a state already exists with the key it's trying to use (the animation's name).

If we wanted to allow repeated calls we could use Animancer.AnimancerLayer.GetOrCreateState(UnityEngine.AnimationClip,System.Boolean) instead, which would create a state the first time then return the same one every time after that.

If we wanted to actually create multiple states for the same animation, we would have to use the optional `key` parameter to specify a different key for each of them.