CS2D 
Convert utf8 encoding to string
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local function utf8_from(t)
local bytearr = {}
for _, v in ipairs(t) do
local utf8byte = v < 0 and (0xff + v + 1) or v
table.insert(bytearr, string.char(utf8byte))
end
return table.concat(bytearr)
end
local function utf8_expend(str) -- Put message
local t = {}
for num in str:gmatch('[^x]+') do
table.insert(t, tonumber(num, 16))
end
return utf8_from(t)
end
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print(utf8_expend('x61x7A')) --> 'az'
print(utf8_expend('xE4xBDxA0xE5xA5xBD')) --> '你好'
print(utf8_expend('xD0x9FxD1x80xD0xB8xD0xB2xD0xB5xD1x82')) --> 'Привет'
