Contact Email: Guard Optional

Optional properties often represent data that may be missing. Before using an optional value, check for undefined. If present, you can safely call methods on it; otherwise provide a fallback.

Your Task

• Complete the function formatContact(c: { name: string; email?: string }): string.
• If email exists, return c.name + ' <' + c.email.toLowerCase() + '>'.
• Otherwise, return c.name + ' (no-email)'.

Examples

• formatContact({ name: 'Ada' }) → 'Ada (no-email)'
• formatContact({ name: 'Grace', email: '[email protected]' }) → 'Grace [email protected]'