Goal: Learn how to write class definitions.

Assignment: A new system is introduced to facilitate the organization and tracking of coding challenges. This system records the participants' details and scores and provides a seamless way to access and update this information.

Write a full class definition for a class named Coder, which has the following members :

Private data members:

A private data member username of type string, representing the coder's unique identifier in the platform.

A private data member skillLevel of type double, indicating the rating of this particular coder.

A private data member challengesSolved of type int, representing the number of challenges completed by this coder.$|$

Public member functions:

A member function called setUsername that accepts a string parameter and assigns it to username. The function returns no value.

A member function called setProblemSkillLevel that accepts a 'doubleparameter and assigns it toskillLevel$`.$ The function returns no value.

A member function called initChallenges that accepts no parameters and sets challengesSolved to $0.$ The function returns no value.

A member function called solveChallenge that accepts no parameters and increases challengesSolved by $1.$ The function returns no value.

A member function called getUsername that accepts no parameters and returns the value of username.

A member function called getSkillLevel that accepts no parameters and returns the value of skillLevel.

A member function called getChallengesSolved that accepts no parameters and returns the value of challengesSolved.

Note: The implementation of the methods should happen outside of the class itself using the Coder:: notation. You must also include any header file that is necessary to define this class and its members.