You are to write yet another C program that reads characters from stdin, reverses lowercase and uppercase letters, that is$,$ converts to lowercase all uppercase letters and vice versa $($again$,$ see ctype.h$),$ and writes the results onto its standard output, stdout. All characters read should be written whether converted or not. This program uses only stdin and stdout, and the stdio library routines. The program will exit$(0)$ when it hits EOF in its input.