* character is a pattern-matching wild card character.
It matches zero or more arbitrary characters. For every command-line argument
containing this character, replace it with one or more command-line arguments
that are all valid matches from the file system. The updated command-line
arguments should be what gets passed to the child process. Here is an example:
hello.py one.txt two.txt
bash$ ls *.txt
bash$ ls *.py
For this assignment, you need only be concerned with pattern-matching files
in the current directory.