input: def search_item_in_array(array: List[str], search_item: str) -> int:
      """ Search through a given array and return the index of the search item.
      If the item is not found, return -1.
      >>> search_item_in_array(['school', 'hospital', 'bookstore', 'mall', 'theatre'], 'bookstore')
      2
      >>> search_item_in_array(['school', 'hospital', 'bookstore', 'mall', 'theatre'], 'park')
      -1
      """
output:     for i in range(len(array)):
          if array[i] == search_item:
              return i
      return -1