text: /******************************************************************************
  Write a function unique(array) that returns an array where all the duplicates
  of the input array have been removed; in other words, every element remaining
  is unique.
  
  Hint: use indexOf
  
  Example:
  unique([1, 1, 2, 3, 3]) => [1, 2, 3]
  *******************************************************************************/
  
  function unique(array) {
    // your code here...
  
  }
  
  /**************DO NOT MODIFY ANYTHING UNDER THIS  LINE*************************/
  module.exports = unique;
  