how to slice something from a string in go code example
Example: golang slice string
First of all, you should really read about strings, bytes and runes in Go.
And here is how you can achieve what you want: Go playground (I was not able to properly paste arabic symbols, but if Chinese works, arabic should work too).
s := "abcdefghijklmnop"
fmt.Println(s[2:9])
s = "something which is display"
fmt.Println(string([]rune(s)[2:9]))