Project 2: Mini UNIX Shell

Challenges:

1. Data Structures:

   For this problem, I need to first parse the commands to identify the input type, output type, and also identify whether it is a pipe.

   To store these information, a create a structure. I can use a vector to store these information or use pointer.

   It is easy to implement in vector, but it is not as effective as pointer does.

   But, when there's a mistake, it is really hard to debug for stack overflow/memory leakage.