USE JAVA PLEASE AND MAKE IT SO IT PROMPTS THE USER FOR A TEXT FILE AND READS THE FILE PLEASE Project Problem: Simplification of Context$-$Free Grammars We learned three context$-$free grammar $($CFG$)$ simplification techniques in our classes: removing $\backslash$epsi $-$rules, unit$-$ rules, and useless rules. In this project, read a CFG from a txt file, simplify it by removing $\backslash$epsi $-$rules and useless rules, and print out the simplified equivalent CFG$.$ No need to care or remove unit$-$rules. For example, given the following CFG in a txt file $(0$ denotes empty string and $-$ denotes arrow head $->)$: S$-$aA$|$aBB A$-$aaA$|0$ B$-$bB$|$bbC C$-$B After processing, your program should print out the following simplified equivalent CFG: S$-$aA$|$a A$-$aaA$|$aa The following are a few more examples you can use to test your program $($I highly recommend that you come up with more examples to make sure the correctness of your program$)$: $(1)$ S$-$AaBaCbD A$-0|$a B$-0|$b C$-0|$c D$-0|$d For the above CFG$,$ the print out should be S$-$aab$|$Aaab$|$aBab$|$AaBab$|$aaCb$|$AaaCb$|$aBaCb$|$AaBaCb$|$aabD$|$AaabD$|$aBabD$|$AaBabD$|$aaCbD$|$AaaCbD$|$aBaCbD$|$AaBaCbD A$-$a B$-$b C$-$c D$-$d