old_contents: def split_and_join(line):
      # write your code here
      line = line.split(" ") # a is converted to a list of strings.
      line = "-".join(line)
      return(line)
  
new_contents: def split_and_join(line):
      """
      Split and join is a simple function that illustrates some string manipulation by creating a variable named line, 
      using the embedded .split() method, to convert to a list of strings and interposing a - character by way of 
      the .join method, and returning the value of the line variable.
      """
      # write your code here
      line = line.split(" ") # a is converted to a list of strings.
      line = "-".join(line)
      return(line)
  
subject: Update HR_pythonStringSplitAndJoin.py