We would like for our appointment class to be a bit more friendly. People usually do not use military hour numbers to refer to times. It might be easier to create appointments if one could enter a time like "10pm" or "9am". Let's do this by adding a new mutator called setTime(). This mutator should take a single string parameter that consists of an hour number followed by "am" or "pm". It will set the field inside the appointment by examining the characters of the string.