read-file-last-line

read-file-last-line

step

1. open file and get file size

2. readAt() form file end,

3. loop

   • read file like pieces, size from 64byte to 128byte to 256byte ...
   • put contents to bytes.Buffer
   • record content length

   until find line break

4. reassemble contents, like from [e,d,bc,a] to [a,bc,d,e]