Package rot13 ports Go's classic ROT13 example — the one used to teach strings.Map and io.Reader in the standard library docs — to an on-chain Gno realm. The core is a pure letter-rotation cipher over ASCII: ROT13 shifts each letter 13 places, which (since the alphabet has 26 letters) makes ROT13 its own inverse. Caesar generalizes it to any shift.
Everything here is pure strings/unicode logic: no state, no randomness, no clock — Render reads its input straight from the gnoweb path.
Caesar generalizes ROT13 to an arbitrary shift. Negative and large shifts are normalized into [0,26). Only ASCII letters move; anything else passes through unchanged. Caesar(s, 13) is exactly Rot13(s).
gnokey query vm/qeval -remote "https://rpc.topaz.testnets.gno.land" -data "gno.land/r/g12cs4cehujpffpjpywmkqj43m6u5ya53nj69sjz/rot13.Caesar(,)"