input: from typing import List
  
  def add_delimiter_between_elements(numbers: List[int], delimiter: int) -> List[int]:
      """ Insert the given 'delimiter' value between each pair of adjacent items in the list 'numbers'
      >>> add_delimiter_between_elements([], 4)
      []
      >>> add_delimiter_between_elements([1, 2, 3], 4)
      [1, 4, 2, 4, 3]
      """
output:     if not numbers:
          return numbers
      
      result = [numbers[0]]
      for num in numbers[1:]:
          result.append(delimiter)
          result.append(num)
      
      return result