In modern operating systems, kernel processes messages are communicated securely by using several encryption mechanisms such as Zig-Zag cipher which divides the message into two parts: the first part contains the odd-positions characters, while the second part contains the even-positions characters. Eventually, the cipher is constructed by concatenating the first part with second part. Using traditional pipes, write a program to produce a full duplex parent/child relationship in which processes can send/receive user data encrypted with Zig-Zag cipher. The communication should cease if either process sends the message Bye.

(C language)