loop through headers differently to have an order and updated README

README.md

@@ -9,3 +9,8 @@ This seems intended by the creators of the language.
 - print header tree
 - delph deeper into different Markdown implementations (like CommonMark)
 - add support for "Setext-style headers"
+
+#### logic ideas
+
+For a tree structure you will probably need parent/child relationships.\
+You might need to create a parent and a child field in the header struct.

main.go

@@ -78,7 +78,9 @@ func main() {
 
 	header_level_count := count_levels(headings)
 
-	for key, value := range header_level_count {
-		fmt.Printf("Header %d occurs %d times.\n", key, value)
+	for i := 0; i <= 6; i++ {
+		if header_level_count[i] != 0 {
+			fmt.Printf("Header %d occurs %d times.\n", i, header_level_count[i])
+		}
 	}
 }