5) Write a C program that reads in a string from the user and determines whether the string is a palindrome (i.e., a word that is spelled the same forwards and backwards). The program should ignore spaces and punctuation, and should be case-insensitive. For example, the strings 'racecar', 'A man a plan a canal Panama', and 'radar' should all be considered palindromes by the program. The strings 'hello', 'world', and 'This is not a palindrome' should not be considered palindromes