Fix counting bug ✅

src/syntax/mod.rs

@@ -72,6 +72,8 @@ mod tests {
         roundtrip("```\n line \n```");
         roundtrip("```\n`\n```");
         roundtrip("``` ` ```");
+        roundtrip("````\n```\n```\n````");
+        test("```lang```", "```lang ```");
         test("```1 ```", "``");
         test("``` 1```", "`1`");
         test("``` 1 ```", "`1 `");

src/syntax/node.rs

@@ -151,8 +151,9 @@ impl Pretty for NodeRaw {
 
         // More backticks may be required if there are lots of consecutive
         // backticks in the lines.
-        let mut count = 0;
+        let mut count;
         for line in &self.lines {
+            count = 0;
             for c in line.chars() {
                 if c == '`' {
                     count += 1;