Mark Breakdown

Task1:
T1-test1: correctly creating background jobs
* correct messages are showing (0.5)
* jobs are actually executed in the background (0.5)
 - - - - - - - - - - - - - - - - - - - - 
mark recieved: 0.5

T1-test2: Ctrl+D
* exits the shell (0.5)
 - - - - - - - - - - - - - - - - - - - - 
mark recieved: 0.5

T1-test3: quit
* exits the shell (0.25)
* correct error to stderr (0.25)
 - - - - - - - - - - - - - - - - - - - - 
mark recieved: 0.5

total
 - - - - - - - - - - - - - - - - - - - - 
mark recieved: 1.5