LS implementation in C

ls: Implement ls in C Overview and Goal The goal of this task is to write your own implementation of the GNU/Linux ls command in the C programming language. Of course, not all the functionality of the original ls has to be implemented: Your program must only behave like the original, invoked with -1 and -F. It must also support a single, optional parameter specifying the file or directory to be listed. If this parameter is not given, the contents of the current directory are listed. Otherwise, either the single file, or the contents of the given directory are listed. Expected Output The program must have the exact same behavior as the GNU/Linux ls command with the options -1 and -F. Important: Directories are listed with / at the end, executable files with * and symlinks with @! See man ls for more details. The following is an example output of GNU/Linux ls: $ ls -1 -F ls* ls.c Makefile [login to view URL] symlink@ Invocation without Parameter If invoked without any parameter, the contents of the current directory are listed: $ ./ls ls* ls.c Makefile [login to view URL] symlink@ Invocation with Optional Directory If a directory is given as parameter, its contents are listed: $ ./ls .. 1-hello/ 2-base64/ 3-ls/ 4-sort/ 5-shell/ [login to view URL] [login to view URL] Invocation with Optional File If a file is given as parameter, only the file is listed: $ ./ls /etc/hostname /etc/hostname Evaluation Total points possible: 5 Minimum number of points required to pass: 4 Points can be obtained as follows: 1 Point: Invocation without any parameter in any directory 1 Point: Invocation with any directory as parameter 1 Point: Invocation with any file as parameter 1 Point: Correct identification of directories ("/") and executables ("*") 1 Point: Correct identification of symlinks ("*") the source has to compile with the attached makefile!