Exercise Three - 40 points Create a txt file called input.txt with text copied from a movie or a product review from the web-do not 3 exceed 100 words. In one single matlab script file (exercise02.m), implement the following: 1. Read in the lines of the text file using the fgetl function. Store the lines of this file in a cell array. Useful functions: for, fopen, fgetl. 2. Preprocessing includes: remove punctuation, convert to lower case, remove stop words. [you can do this before or after tokenizing the string, see funs lowerO for lower case conversion] Parse your stored lines of text into their constituent words using the strtok function.Store all of the words in the entire document in a cell array with one word per index 3. 4. Create a lexicon consisting of all of the unique words in all the files. Useful function: unique. 5. Create a column vector representing how many times each lexicon word occurs in the document. This is a word vector representation for the document. Useful function: zeros