local zerstr=string.char(0x00);
local sss='ggggs222SSS'..'\0'..'HDHAS55GAaqqq';
print(sss)
q_sourcestr = string.format("%q", sss)
print(q_sourcestr)
local upperstr = string.upper(q_sourcestr);
print(upperstr)
local lowstr = string.lower(q_sourcestr);
print(lowstr)