Lardless

Alejandro has gotten to the point where he can't read an email containing the
word "lard" without drooling all over his keyboard. To combat this problem he
filters his email with an algorithm that searches the body of the email for any
word containing the word lard, and strips it out. Make like Alex and create a
class Lardless, containing the method StripLard(String). It takes any kind of
string and removes all cases of the substring "lard", regardless of case. It
returns the depleted string. Remember, under no circumstances can the return
string contain the word lard, so make sure you take care of the case of lalardrd.
(Hint: Since this problem turned out to be a little harder than I had planned,
try starting by converting the input string to all lower case to begin with,
and take it from there.)