GetFileExtension returns the file extension for the given language.

New creates a new CustomError.

AbstractType represents a data type that can be atomic or composite.

CustomError defines an error with a status code and message.

InputOutput represents example inputs and expected outputs for a function.

Parameter represents a function parameter.

Question represents a coding question with metadata and configurations.

Solution represents a user-provided solution for a coding question.

AtomicType represents basic types like Integer, String, etc.

CompositeType represents composite types like TreeNode, Array, etc.

AtomicType represents basic types like Integer, String, etc.

PredefinedCategory represents categories for questions.