$/**$

Initialize an empty sequence with a specified initial capacity. Note that

the append method works

efficiently $($without needing more memory$)$ until this capacity is reached.

@param initialCapacity

the initial capacity of this sequence

@precondition

initialCapacity is non$-$negative.

@postcondition

This sequence is empty and has the given initial capacity.

@exception IllegalArgumentException

Indicates that initialCapacity is negative.

@exception OutOfMemoryError

Indicates insufficient memory for an array with this many elements.

new Ball$[$initialCapacity$].$

$**/$

public BallSeq$($int initialCapacity$)$

$//$ TODO: Implement this code.

assert wellformed$()$ : "Invariant false at end of constructor";

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