input: Write a function to print the length of a given string.
  assert print_length("Python")=="Length of the given string is: 6"
  assert print_length("Code")=="Length of the given string is: 4"
  assert print_length("")=="Length of the given string is: 0"
output: def print_length(s):
      return f"Length of the given string is: {len(s)}"