Function executable_from_command_line 

pub fn executable_from_command_line(command_line: &str) -> Option<PathBuf>

Reads the executable back out of a command line quoted by [quote_argument].

service status needs this because the Windows Service Control Manager stores the binary and its arguments as one string and hands the whole thing back from QueryServiceConfigW. Comparing a record against a registration means splitting that string the same way Windows itself does.

Returns None for an empty or whitespace-only command line, which is the only input with no first argument to find.