"""
 b3.py

 third version of happy birthday song.

 Print only in main.
 Reduce repitition.

 Other functions have clean args and return values.

"""

def to_you_line(first_letter, punctuation):
    """ Return one line of the birthday song """
    return "{}appy birthday to you{}\n".format(
        first_letter, punctuation)

def dear_line(name):
    """ Return line with 'dear' from HBS
        (Happy Birthday Song)"""
    return "happy birthday dear {},\n".format(name)

def song(name):
    return to_you_line('H', ',')  + \
           to_you_line('h', ',')  + \
           dear_line(name) + \
           to_you_line('h', '!')

def main():
    print(song('Sally'))

main()