input: Write a function to print the length of a given string. The function should take a single string as input and use the `len()` function to determine the length of the string, then print the result. If the input string is empty, it should print "The input string is empty.".
  assert print_string_length("Python")==None
  assert print_string_length("Hello, World!")==None
  assert print_string_length("")==None
  assert print_string_length("   ")==None
output: def print_string_length(s):
      if s == "":
          print("The input string is empty.")
      else:
          print(len(s))