Autograder demo: Randomized function name

This is a small example question that shows how we can randomize questions using the Python autograder. server.py randomizes a function name and a list of input/output pairs the function must correctly handle, plus a default output for every other case. The test file checks these pairs and the default output.

Design a function named foo that takes a string as input and produces a string as output. For each of the input strings listed in the following table, it should produce the corresponding output: