User Registration and Welcome Email

You're implementing a user registration system that uses an API call to create users. Once a user has been registered, a welcome email should be sent. The email should only be sent after the user is successfully registered.

Instructions:

  • Write a function named registerUser that simulates creating a user by calling api.registerUser() (assume this API function is provided). This function should accept a callback function as an argument and send the welcome email once the user has been successfully registered.

  • Write another function named sendWelcomeEmail that should be executed only after api.registerUser() successfully completes the registration.

Note: Use only callbacks for this.

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