Parameter arguments in function get_options is not const

[smurthys]

Parameter arguments in function get_options is not const. For safety, that parameter should be marked const.

Making this change will also need a change in main, but an easy change.

[cmcmone]

I agree, change the parameter to const is better, to prevent the pointer from changing. Thanks @smurthys for catch this issue.

[smurthys]

@cmcmone We need to assure that get_options does not modify either the C-string pointers or the C-string content. I wrote a SIGCPP blog post about this topic: