Final Score:
Project collaborator : Hugo Vernhes
dup/dup2 : http://www.cs.loyola.edu/~jglenn/702/S2005/Examples/dup2.html
https://www.cs.purdue.edu/homes/grr/SystemsProgrammingBook/Book/Chapter5-WritingYourOwnShell.pdf
https://www.geeksforgeeks.org/making-linux-shell-c/