convertNumber

A function that converts a Number to a string, the contents of which depends on the number’s prime factors. If the number contains 3 as a prime factor, output "Pling".

• If the number contains 5 as a prime factor, output "Plang".
• If the number contains 7 as a prime factor, output "Plong".
• If the number does not contain 3, 5, or 7 as a prime factor, just pass the number’s digits straight through. Examples
• 28's prime-factorization is 2, 2, 7.
• In raindrop-speak, this would be a simple "Plong".
• 1755 prime-factorization is 3, 3, 3, 5, 13.
• In raindrop-speak, this would be a "PlingPlang".
• The prime factors of 34 are 2 and 17.
• Raindrop-speak doesn’t know what to make of that, so it just goes with the straightforward "34".
  Your logic should be as efficient as possible (with minimal iterations).
  Also write tests for your solution using Mocha & Chai (at least 10 test cases).
  Finally, push the solution and tests to GitHub.