make application with base logic

internal/common/client/sravni/helpers.go

@@ -0,0 +1,20 @@
+package sravni
+
+import "golang.org/x/net/html"
+
+func findNode(parent *html.Node, eq func(*html.Node) (found, deeper bool)) *html.Node {
+	for child := parent.FirstChild; child != nil; child = child.NextSibling {
+		found, deeper := eq(child)
+		if found {
+			return child
+		}
+		if deeper {
+			deeperChild := findNode(child, eq)
+			if deeperChild != nil {
+				return deeperChild
+			}
+		}
+	}
+
+	return nil
+}