# Functions
NewClient returns an Exercism API Client.
NewIteration prepares an iteration of a problem in a track for submission to the API.
# Variables
ErrUnknownLanguage represents an error returned when the language requested does not exist.
UserAgent lets the API know where the call is being made from.
# Structs
Client contains the necessary information to contact the Exercism APIs.
Iteration represents a version of a particular exercise.
PayloadError represents an error message from the API.
PayloadProblems represents a response containing problems.
PayloadSubmission represents metadata about a successful submission.
Problem represents a specific problem in a given language track.
Submission is an iteration that has been submitted to the API.
SubmissionInfo contains state information about a submission.
Track is a collection of problems in a given language.