/**
 * Simplifies a name by extracting alphanumeric parts, removing duplicates, and joining with underscores
 * Useful for creating clean CSS class names or identifiers from complex strings
 *
 * @param {string} name - The original name to simplify
 * @returns {string} Simplified name with alphanumeric parts joined by underscores
 *
 * @example
 * simplifyName('my-button--large') // returns 'my_button_large'
 * simplifyName('header.nav.item') // returns 'header_nav_item'
 * simplifyName('duplicate-duplicate-word') // returns 'duplicate_word'
 */
export function simplifyName(name: string): string;