You are given a file consisting of students' narses in the following form lastName, firstName middleName. (Note that student may not have a middle name.) Write a program that converts cach name to the following form: firstName middleName lastName. Your program must read each student's entire name in a variable and must consist of a function that takes as input a string, consists of a student's name, and returns the string con sisting of the altered name. Use the string function find to find the index of ,; the function length to find the length of the string; and the function substr to extract the firstName , middleName , and lastName .