Q$3)(26$ pts$.)$ Write a C$++$ function to get $4$ strings as character pointers as input parameters as follows:

String$1$: first name

String$2$: middle name

String$3$: surname

String$4$: outputstring

The function also gets an integer parameter, option $($opt$).$ If the option is $1,$ the output string should have firstname$-$middlename$-$surname sequence. If the option is $0$ the output string should have surnamemiddlename$-$firstname sequence. As if the option is different than $0$ and $1,$ it should copy "notavallable" to output string.

void namestring$($char $*$ s$1,$ char$*$ s$2,$ char ${?}^{**}$ s$3,$ char $*$ sout, int opt$)($

Q$4)(30$ pts$.)$ Consider the following structure:

struct std$\{$

int id;

char name$[30]$;

$\}$std$\_$array$[100]$;

Write a complete $\frac{C}{C}++$ program that opens the files $"$Id$.$txt$"$ and "name.txt$"$ that includes id's and names of the students. The program should load from the files to the array of structures, given above as std arrav. Then, the program should print the id's and names of the corresponding students to the output file "studentinfo.txt$".$

Assume that the sizes of files $"$id$,$ txt$"$ and "name.txt$"$ are the same, but unknown. The program should scan until the end of file. Also assume that the id's and the names are corresponding.