build it using .c and a .h file please

2. (20 pts) Write a simple single thread CSC4420 shell , i.e., no concurrent commands, to support at least the following built-in commands: prompt can set to any string you input, in addition to the current history event number, i.e, %h as in csh; o url : list the course web site o hour : list class times o room : list classroom location o desp: list the description of this course o text : list the textbook o ref: list the reference books prof: list the professor's name pol : professor's office location o poh : professor's office hours pma : professor's email address o ta : list the TA's name o tol: TA's office location o toh : TA's office hours o tma : TA's email address history : list history of events up to the number you set help : list all the available commands exit or quit : exit CSC4420 shell