Complete the function, which calculates how much you need to tip based on the total amount of the bill and the service.
You need to consider the following ratings:
- Terrible: tip 0%
- Poor: tip 5%
- Good: tip 10%
- Great: tip 15%
- Excellent: tip 20%
The rating is case insensitive (so "great" = "GREAT"). If an unrecognised rating is received, then you need to return:
"Rating not recognised"in Javascript, Python and Ruby...- ...or
nullin Java - ...or
-1in C#
Because you're a nice person, you always round up the tip, regardless of the service.