Brad Arant
5c703f5620
Both matched their function name but had empty branch bodies, silently
producing nothing regardless of arguments. reverse(str) follows the same
single-argument shape as trim/toupper/tolower; concat(a, b, ...) follows
the same variadic comma-separated shape as max/min.
reverse() converts to std::string and reverses in place via the already-
imported <algorithm> (std::reverse), then assigns back through MString's
std::string constructor. concat() starts from the first argument and
appends each subsequent one via MString's own operator<<(ZString).
Verified via real jet-2.0 runs: reverse('hello') -> "olleh",
concat('a','b','c') -> "abc", concat('x','y') -> "xy". Full 9-script
regression suite (custom tag scoping, dump tag tree, try/catch, if/else,
keyword sigil) still passes unchanged.