This exercise calls for you to write some async flow-control code to more properly handle the provided callback mess as shown in "ex5.js".

Expected behavior:

• Request all 3 files at the same time (in "parallel").
• Render them ASAP (don't just blindly wait for all to finish loading)
• BUT, render them in proper (obvious) order: "file1", "file2", "file3".
• After all 3 are done, output "Complete!".

Use either native promises, the asynquence lib (provided), or your own favorite async/promises library/utility.