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3. Write a C program that takes a string from the user and finds out if the string is a palindrome on not. If the string is palindrome then the program turns all the alphabets in the string into upper case alphabets using the user defined function *uppercase (char * s) and appends it to a file which stores palindrome strings. The program can also read from the file and print its contents to the console window. . If the string is not a palindrome then the program turns all the alphabets in the string into lower case alphabets using the user defined function *lowerCase (char * s) and appends it to another file which stores the non palindrome strings. The program can also read from the file and print its contents to the console window