feature: added string utils

pkg/string/string_utils/line_separator_provider.go

@@ -0,0 +1,14 @@
+package string_utils
+
+import "runtime"
+
+func GetLineSeparator() string {
+	switch runtime.GOOS {
+	case "windows":
+		return "\r\n"
+	case "darwin":
+		return "\r"
+	default:
+		return "\n"
+	}
+}