Use rune arrays instead of go strings for UTF-8 support

src/runestring/runestring.go

@@ -0,0 +1,35 @@
+package runestring
+
+type RuneString []rune
+
+func Split(s RuneString, sep rune) []RuneString {
+	ret := make([]RuneString, 0)
+
+	currentStr := make(RuneString, 0)
+	for _, r := range s {
+		if r == sep {
+			ret = append(ret, currentStr)
+			currentStr = make(RuneString, 0)
+			continue
+		}
+		currentStr = append(currentStr, r)
+	}
+
+	return ret
+}
+
+func Index(s, substr RuneString) int {
+	substrIndex := 0
+	for i, r := range s {
+		if r == substr[substrIndex] {
+			if substrIndex == len(substr) {
+				return i - substrIndex
+			}
+			substrIndex++
+		} else {
+			substrIndex = 0
+		}
+	}
+
+	return -1
+}