pull out a method

(will be needed for reverse)

src/display.rs

@@ -54,12 +54,25 @@ fn display_node(
         Some(0) => return,
         Some(d) => Some(d - 1),
     };
+
     match get_size(to_display, node_to_print) {
         None => println!("Can not find path: {}", node_to_print),
         Some(size) => {
             print_this_node(node_to_print, size, is_biggest, short_paths, indentation_str);
-            let new_indent = clean_indentation_string(indentation_str);
+            fan_out(node_to_print, found, to_display, short_paths, new_depth, indentation_str);
+        }
+    }
+}
 
+fn fan_out(
+    node_to_print: &str,
+    found: &mut HashSet<String>,
+    to_display: &[(String, u64)],
+    short_paths: bool,
+    new_depth: Option<u64>,
+    indentation_str: &str,
+) {
+    let new_indent = clean_indentation_string(indentation_str);
     let ntp_with_slash = strip_end_slash(node_to_print);
 
     // Annoying edge case for when run on root directory
@@ -87,8 +100,6 @@ fn display_node(
             );
         }
     }
-        }
-    }
 }
 
 fn clean_indentation_string(s: &str) -> String {