Ping Pong!

A game of table tennis almost always sounds like Ping! followed by Pong! Therefore, you know that Player 2 has won if you hear Pong! as the last sound (since Player 1 didn't return the ball back).

Given an array of Ping!, create a function that inserts Pong! in between each element. Also:

• If win equals true, end the list with Pong!.
• If win equals false, end with Ping! instead.

Examples

pingPong(["Ping!"], true) ➞ ["Ping!", "Pong!"]

pingPong(["Ping!", "Ping!"], false) ➞ ["Ping!", "Pong!", "Ping!"]

pingPong(["Ping!", "Ping!", "Ping!"], true) ➞ ["Ping!", "Pong!", "Ping!", "Pong!", "Ping!", "Pong!"]

Notes

• You will always return the ball (i.e. the Pongs are yours).
• Player 1 serves the ball and makes Ping!.
• Return an array of strings.