The program we provide:$-$ Takes as a command$-$line argument the name of a file, which it opens.$-$ The program then asks your function $(`$your$\_$fcn$()`)$ for a string, writes that string to the file, and closes the file.$-$ It then re$-$opens the file, and attempts to "sanitize" the string you provided by removing all instances of the substring $"`414`"$ from it$.-$ Finally, it overwrites the file with this "sanitized" version of the string.For example, if your function generated the string "I love CMSC$414!"$ thenwe would get the following output:$```$cmsc$414$@cmsc$414$:~$ $./$task$0$a$.$x file.txtcmsc$414$@cmsc$414$:~$ cat file.txtI love CMSC$!```**$Your goal is to write $`$your$\_$fcn$()`$ in such a way that the file whose name isprovided on the command$-$line still has the substring $"`414`"$ in it$.**$A simple way to test for this is with the command $`$grep $414`$ which returns linescontaining the string $"`414`"$ as follows:$```$cmsc$414$@cmsc$414$:~$ grep $414$ file.txt$```$If this returns nothing $($as the above case would$),$ then that means the filedoes not have $"`414`"$ in it$,$ resulting in no credit.$**$you must provide a$*$functionally unique$*$ solution in each of the three$**$; they cannot simply beslight variations of one another $($e$.$g$.,$ if one of your solutions was$`$printf$($x$)`$ then another cannot be $`$puts$($x$)`$ as those are functionally the samething$).$There are many different ways to solve this! Some might involve bufferoverflows, and some might not. We are not requiring any one particularsolution; just like with any attack, what matters is whether it achievesthe goal, even if it's not a method we anticipated. $*$Be creative$*$ and have funwith it$!$Here's a working example:int your$\_$func$($char$*$ your$\_$string$)\{$ strcpy$($your$\_$string, $"441414")$; return $0$;$\}$Here$\text{'}$s the function that removes the string:char $*$strremove$($char $*$str$,$ const char $*$sub$)\{$ size$\_$t len $=$ strlen$($sub$)$; if $($len $>0)\{$ char $*$p $=$ str; while $(($p $=$ strstr$($p$,$ sub$))!=$ NULL$)\{$ memmove$($p$,$ p $+$ len, strlen$($p $+$ len$)+1)$; $\}\}$ return str;$\}$Rewrite your$\_$func$($char$*$ your$\_$string$)$ at least in $2$ different ways that will cause $414$ to still be in file.txt