Write a C program myfind whose behavior resembles that of the system command find.

myfind accepts the following parameters:

$ myfind filename startpath 

where

filename is a substring that is matched against each filename in each directory that myfindinspects. If a file name matches filename or if the substring filename occurs within a file name, the name of that file is printed.

startpath is an optional parameter that specifies the directory where myfind must start the search. If this parameter is not specified, myfind starts in the current directory.