The barebones API is a really simple .NET Core based API (with NUnit tests) which server as a staging ground for all sorts of useful utils. The list below highlights the utils that you will need to build, along with sensible test coverage for this to be useful.
This isn't a utility it's just a health check, you can just return HTTP 200 to show the endpoint is up.
This utility will take a string in the path and return a simple true or false based on whether the given string is a palindrome.
This utility will take a string in the path and return the length, in terms of number of characters, as an integer.
This utility will take a string and reverse it, returning the result as a string in kind.