The left$-$shift operator can be used to pack four character values into a four$-$byte

unsigned int variable. Write a program that inputs four characters from the keyboard

and passes them to function packCharacters. To pack four characters into an unsigned

int variable, assign the first character to the unsigned int variable, shift the unsigned int

variable left by $8$ bit positions and combine the unsigned variable with the second

character using the bitwise inclusive OR operator. Repeat this process for the third and

fourth characters. The pro$-$ gram should output the characters in their bit format before

and after they're packed into the un$-$signed int to prove that the characters are in fact

packed correctly in the unsigned int variable. WRITE THIS IN C AND FROM SCRATCH PLEASE.