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 a list 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

ping_pong(["Ping!"], True) ➞ ["Ping!", "Pong!"]

ping_pong(["Ping!", "Ping!"], False) ➞ ["Ping!", "Pong!", "Ping!"]

ping_pong(["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 a list of strings.