On this line

dmt := fmt.Sprintf("/c %s&cd %s&sqlite3.exe %s ".read tmp.sql"", path[0:2], path, newDbName)

your string ends at the " before .read. Use a raw string literal or put a backslash before the ".

In general we use the issue tracker for bugs. You will get better and faster help with using Go if you use a forum rather than the issue tracker. See https://golang.org/wiki/Questions. Thanks.

like this, still has that problem.

newDbName = "C:\\Users\\ma\\Desktop\\sqlite3\\malformed\\root\\test.db"
path = "C:\\Users\\ma\\Desktop\\sqlite3\\malformed\\root"
dmt := fmt.Sprintf(`%s&cd %s&sqlite3.exe %s ".read tmp.sql"`, path[0:2], path, newDbName)
cmd := exec.Command("cmd.exe", dmt)
out1, err := cmd.CombinedOutput()
if err != nil{
	fmt.Println(err)
}

this too

newDbName = "C:\\Users\\ma\\Desktop\\sqlite3\\malformed\\root\\test.db"
path = "C:\\Users\\ma\\Desktop\\sqlite3\\malformed\\root"
dmt := fmt.Sprintf("/c %s&cd %s&sqlite3.exe %s \".read tmp.sql\"", path[0:2], path, newDbName)
cmd := exec.Command("cmd.exe", dmt)
out1, err := cmd.CombinedOutput()
if err != nil{
	fmt.Println(err)
}

Please see https://golang.org/wiki/Questions.

i'm in China, i can't open that website

Asking Questions
Unlike many projects, the Go project does not use GitHub Issues for general discussion or asking questions. GitHub Issues are used for tracking bugs and proposals only.

For asking questions, see:

Stack Overflow with questions tagged "go"

The Go Forum, a web-based forum

Gophers Slack, use the invite app for access. The #general channel is a good starting point.

Go Community on Hashnode with questions and posts tagged with "go"

The golang-nuts mailing list

IRC channel #go-nuts on Freenode

If we closed your issue as a question with a link to this wiki, we apologize. Please ask the question on one of the above forums.