Write a program in C called email.c that accepts an email address from stdin and then checks whether the entered email address is in the correct format $($see below$).$ If it is not in the correct format then your program should print an error message informing the user of the correct format. If it is in the correct format, then your program should print it back out in full to the screen and exit.

Correct email format: A valid email address consists of five parts: $(1)$ one or more characters $($only letters or numbers$),$ followed by $(2)$ the $"$at$"$ symbol $($@$),$ followed by $(3)$ one or more characters $($only letters or numbers$),$ followed by $(4)$ the period$/$dot symbol $(.),$ followed by $(5)$ one or more characters $($only letters or numbers$).$