input: from typing import List
  
  def concatenate_strings(strings: List[str], separator: str) -> str:
      """ Takes a list of strings and returns a single string that is the concatenation of all elements in the list, separated by the given delimiter/separator.
      >>> concatenate_strings(["Sample", "Text", "Hello"], "/")
      'Sample/Text/Hello'
      """
output:     result = ""
      for i, s in enumerate(strings):
          result += s
          if i < len(strings) - 1:
              result += separator
      return result