Feature: Now a library as well as a binary

Cargo.toml

@@ -1,8 +1,14 @@
 [package]
 name = "page_rank"
 version = "0.1.0"
-edition = "2021"
+edition = "2018"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[[bin]]
+name = "page_ranker"
+path = "src/bin/main.rs"
+
+[lib]
+name = "page_rank"
+path = "src/lib/lib.rs"
 
 [dependencies]

src/bin/main.rs

@@ -0,0 +1,28 @@
+use page_rank::Graph;
+
+fn main() {
+    let mut pages: Graph<char> = Graph::new();
+    pages.add_page('A');
+    pages.add_page('B');
+    pages.add_page('C');
+    pages.add_page('D');
+    pages.add_page('E');
+
+    pages.add_link('A', 'E');
+
+    pages.add_link('B', 'A');
+    pages.add_link('B', 'D');
+    pages.add_link('B', 'E');
+
+    pages.add_link('C', 'B');
+
+    pages.add_link('D', 'C');
+
+    pages.add_link('E', 'D');
+    
+    // println!("{pages:?}");
+    pages.page_rank(40);
+    for (page, score) in pages.get_sorted_scores() {
+        println!("{page} => {score:.2}")
+    }
+}

src/lib/lib.rs

@@ -1,32 +1,5 @@
 use std::{collections::HashMap, hash::Hash};
 
-fn main() {
-    let mut pages: Graph<char> = Graph::new();
-    pages.add_page('A');
-    pages.add_page('B');
-    pages.add_page('C');
-    pages.add_page('D');
-    pages.add_page('E');
-
-    pages.add_link('A', 'E');
-
-    pages.add_link('B', 'A');
-    pages.add_link('B', 'D');
-    pages.add_link('B', 'E');
-
-    pages.add_link('C', 'B');
-
-    pages.add_link('D', 'C');
-
-    pages.add_link('E', 'D');
-    
-    // println!("{pages:?}");
-    pages.page_rank(40);
-    for (page, score) in pages.get_sorted_scores() {
-        println!("{page} => {score:.2}")
-    }
-}
-
 #[derive(Debug, Clone)]
 pub struct Graph<T> {
     nodes: HashMap<T, Node<T>>,