How to loop through an array of strings?

Question

Lua

There is an array of strings, you need to access each and read character by character:

lines = {
       "sdss",
       "vfbf"
      }
for i=1,#lines do
   line = lines[i]
   for j=1, #line do print(line[j]) end
end

Questions:
1. Is it possible to make it more elegant in lua?
2. This code prints nil 8 times, although there should be characters. What have I done wrong?
PS did in https://www.lua.org/cgi-bin/demo

Answer 1

for i = 1, #lines do
   line = lines[i]
   for j = 1, #line do 
     print(string.sub(line, j, j))
   end
end

https://rextester.com/VKJ93178