input: Write a function that takes in two strings and returns the combined length of both strings.
  
  def get_string_length(string_1, string_2):
      return len(string_1 + string_2)
  
  assert get_string_length("Hello", "World")==10
  assert get_string_length("Python", "Programming")==19
  assert get_string_length("Short", "String")==11
  assert get_string_length("", "")==0
  assert get_string_length("JustOneString", "")==13
output: def get_string_length(string_1, string_2):
      return len(string_1 + string_2)