input: from typing import Tuple
  
  def concatenate_two_strings(string1: str, string2: str) -> str:
      """ Concatenate two given strings with a space in between and return the result.
      >>> concatenate_two_strings("Hello", "World")
      'Hello World'
      >>> concatenate_two_strings("Python", "Programming")
      'Python Programming'
      """
      return string1 + " " + string2
output:     return string1 + " " + string2