Lua凯撒密码：字母位移的绕回加解密

local function caesar(s, k)
    local out = {}
    for i = 1, #s do
        local b = s:byte(i)
        if b >= 97 and b <= 122 then
            b = (b - 97 + k) % 26 + 97
        end
        out[#out + 1] = string.char(b)
    end
    return table.concat(out)
end

local function caesarFull(s, k)
    local out = {}
    for i = 1, #s do
        local b = s:byte(i)
        if b >= 97 and b <= 122 then
            b = (b - 97 + k) % 26 + 97
        elseif b >= 65 and b <= 90 then
            b = (b - 65 + k) % 26 + 65
        end
        out[#out + 1] = string.char(b)
    end
    return table.concat(out)
end
local p = getplayerbyname("cipher01")
sendmsg(p, 1, caesarFull("Attack AtDawn", 3))