The function below takes two parameters: a list of strings (string_list) and a string containing a single character (char). Complete the function to return the shortest string from the list that contains the character char. This should be case insensitive, so 'a' is the same as 'A'. All of the strings in string_list are shorter than 50 characters.
a. shortest_string_with_char(string_list, char)
b. shortest_string(char, string_list)
c. get_shortest_string(string_list, char)
d. find_shortest_string_with_char(char, string_list)