toml: small refactor, move all json functionality to submodule (#12502)

vlib/toml/util/util.v

@@ -25,44 +25,3 @@ pub fn is_illegal_ascii_control_character(byte_char byte) bool {
 pub fn printdbg(id string, message string) {
 	eprintln(id + ' ' + message)
 }
-
-// parse_dotted_key converts `key` string to an array of strings.
-// parse_dotted_key preserves strings delimited by both `"` and `'`.
-pub fn parse_dotted_key(key string) ?[]string {
-	mut out := []string{}
-	mut buf := ''
-	mut in_string := false
-	mut delim := byte(` `)
-	for ch in key {
-		if ch in [`"`, `'`] {
-			if !in_string {
-				delim = ch
-			}
-			in_string = !in_string && ch == delim
-			if !in_string {
-				if buf != '' && buf != ' ' {
-					out << buf
-				}
-				buf = ''
-				delim = ` `
-			}
-			continue
-		}
-		buf += ch.ascii_str()
-		if !in_string && ch == `.` {
-			if buf != '' && buf != ' ' {
-				out << buf[..buf.len - 1]
-			}
-			buf = ''
-			continue
-		}
-	}
-	if buf != '' && buf != ' ' {
-		out << buf
-	}
-	if in_string {
-		return error(@FN +
-			': could not parse key, missing closing string delimiter `$delim.ascii_str()`')
-	}
-	return out
-}