input: Write a function to calculate and print the length of a given string. If the input string is empty, print "Empty string".
  assert calculate_string_length("Python") == "Length of the given string is: 6"
  assert calculate_string_length("") == "Empty string"
output: def calculate_string_length(s):
      if s == "":
          return "Empty string"
      else:
          return f"Length of the given string is: {len(s)}"