Write java program to create a compiler based on an existing compiler

Given: [login to view URL] is the code for the exiting compiler when executed as "java S1 S1" the program takes in S1.s as the input and creates S1.a as the output. it basically takes inputs like "x = +3 + -2 + 1;" and outputs assembly code. Required: modify [login to view URL] to meet certain specifications mentioned in detail in the attached files "[login to view URL]" (which is a page from the book, attached the book for reference) attached: reference book (epub reader required) [login to view URL] ( J1 package , contains [login to view URL], S1.a etc)