Function panda_parse_string_req 

pub unsafe extern "C" fn panda_parse_string_req(
    args: *mut panda_arg_list,
    argname: *const c_char,
    help: *const c_char,
) -> *const c_char

panda_parse_string_req() - Get value corresponding to this plugin arg as a string. @args: The previously parsed panda_arg_list. @argname: The name of the argument in args. @help: Help text.

Look through the arguments in args, and if any have name argname, return the associated string value.

As this argument is required, if it is not found, plugin load should fail.

Return: a string value.