Write a Matlab program to accept a string as input and determine if this string is a palindrome. A palindrome is a sentence that reads the same backward as forward, such as "Reward a Toyota drawer" or Napoleon's classic lament, "Able was I ere I saw Elba". Punctuation marks, blanks, and letter cases shall have no effects. Therefore your program should remove punctuation marks and blanks first, convert all letters to lowercase, then determine if the resulting string reads the same backward as forward. Output appropriate messages. You cannot use the built-in functions upper, lower, deblank, or isletter. Run your program with the two sentences given above, then "Today is such a nice day!" and "A man, a plan, a cat, a canal: Panama!"