input: Write a function to print the length of a given string. If the input string is empty, print "Length of the given string is: 0". The function should take a single argument, which is the input string.
  assert string_length("Python")==None
  assert string_length("")==None
  
  string_length("Python") should print: Length of the given string is: 6
  string_length("") should print: Length of the given string is: 0
output: def string_length(s):
      if s == "":
          print("Length of the given string is: 0")
      else:
          print(f"Length of the given string is: {len(s)}")