Lua字符串交叉：双串交替的间隔拼接

local function interleave(a, b)
    local out = {}
    for i = 1, math.min(#a, #b) do
        out[#out + 1] = a:sub(i, i)
        out[#out + 1] = b:sub(i, i)
    end
    return table.concat(out)
end

local function mergeMix(a, b)
    local head = interleave(a:sub(1, #b), b)
    return head .. a:sub(#b + 1)
end
local p = getplayerbyname("mix01")
sendmsg(p, 1, mergeMix("abcd", "12"))