Add current_file_path
Add get_dir
Move get_dir to String's method
Guard for get_dir as a function
Add current_dir
Add String's get_filename
Add some convenient functions to extract dir & filename
Remove get_dir as a separated function
Add expand_path as a method of String
Use String's methods instead of function @ fs utils
Apply String's fs_utils methods instead of functions
Apply String's fs_utils methods instead of functions