I have to make a program in bash

here what it needs to do:

1. Read a file named user.txt

which contains all the usernames (one by line)

sab

mark

gilian

ethan

2. I have to create those user with the cmd useradd

3.Each user has to have their own repository and their own password

4. Installing program

(that's the part I got lost)

4.1 They asked me to compile this program and to execute it

#include stdio.h>

int main() {

char nom [15];

printf(" Entrez votre nom: ");

fgets (nom, 15, stdin);

printf("InBonjour %S", nom);

return 0;

}

4.2 After that I need copy the executable to a repository that's part of the PATH of the previous 4 users

4.3 I need to modify the permission of the executable so that only those 4 user can execute the file