Problem
1) Write a program in C which receives a file name on the command line and which states whether or not the user of the program is in the same group as the owner of the file
2) Write a program in C which receives a file name on the command line and in the case the file is a directory, states whether or not it contains any visible sub-directories
3) Write a program in C which receives a file name on the command line and displays the home directory of the owner of the file.