$-$ char$[]$ msg : The message string to be passed from one process to another. When the operation mode is write,the message string is written to corresponding process.Otherwise, the contents of the read operation are stored inside this message string.$($Hint $-$ Use pointers$)$

$-$ int mode: $0$ denotes read from child process, $1$ denotes write to child process, $2$ denotes read from parent process, $3$ denotes write to parent process.

$-...$ : You are free to extend the functionality to use any other arguments needed to achieve the desired functionality.

Implement the piped system call as described above and also,write a test file to validate the above functionality. The test file should show two$-$way communication between the child and parent processes. The test file is run and graded based on these results.