Problem Statement: A company that wants to send data over the Internet has asked you to writee a program that will encrypt it so that it may be transmitted more securely. All the data is transmitted as four-digit integers.

Your application should read a four-digit integer entered by the user and encrypt it as follows:

Replace each digit with the result of adding 7 to the digit and getting the remainder after dividing the new value by 10.

Then swap the first digit with the third and swap the second digit with the fourth.

Then print the encrypted integer.

Writee a separate application that inputs an encrypted four-digit integer and decrypts it (by reversing the encryption scheme) to form the original number

To successfully complete these programs you will need to:

1) Use the macros EXIT_FAILURE and EXIT_SUCCESS define in the library stdlib.h to indicate unsuccessful or successful termination of your program

2) Define DIGITS as a macros in your program. DIGITS should be defined as 4.

3) Write the following functions in your program:

crypto( ) should encrypt a 4 digit number

countDigit() to count the digits

decrypto( ) should decrypt a 4 digit number

4) Your function should return the encrypted number.

HINT: Separate the digits and store them in an array.

5) Your main() should use the function scanf( ) to read an integer from the keyboard.

6) You must do the input validation

7) Print the newly encrypted number and exit with EXIT_SUCCESS