"""
Write a function called truncate that will shorten a string 
to a specified length, and add "..." to the end.  Given a 
string and a number, truncate the string to a shorter string 
containing at most n characters. For example, 
truncate("long string", 5) should return a 5 character truncated 
version of "long string".  If the string gets truncated, the 
truncated return string should have a "..." at the end. Because 
of this, the smallest number passed in as a second argument should 
be 3. 
"""

def truncate(text: str, trunc: int):
  if trunc < 3:
    return "Truncation must be at least 3 characters."
  return text[0:trunc-3] + "..." if trunc <= len(text) else text

print(truncate("Hello World", 6))

'''
truncate("Super cool", 2) # "Truncation must be at least 3 characters."
truncate("Super cool", 1) # "Truncation must be at least 3 characters."
truncate("Super cool", 0) # "Truncation must be at least 3 characters."
truncate("Hello World", 6) # "Hel..."
truncate("Problem solving is the best!", 10) # "Problem..."
truncate("Another test", 12) # "Another t..."
truncate("Woah", 4) # "W..."
truncate("Woah", 4) # "..."
truncate("Yo",100) # "Yo"
truncate("Holy guacamole!", 152) # "Holy guacamole!"
'''