Frees memory allocated by nstd_env_path_to_exe, nstd_env_current_dir or
nstd_env_temp_dir.
Parameters:
char **path - String from nstd_env_path_to_exe or nstd_env_current_dir.
Returns the path of a temporary directory.
Use nstd_env_free_path to free memory allocated by this function.
Returns: char *path - The path of the temp dir.
Returns an array of strings that contain the environment variables.
Parameters:
NSTDUSize *size - Number of variables.
Returns: char *vars - The environment variables keys.