update metadata search

Author: jiangy10

src/review-scripts.js

@@ -82,7 +82,21 @@ async function reviewPR() {
         if (hasMetadata(content)) {
             // find the line number of the first two "---"
             const metadataStart = content.indexOf('---');
-            const metadataEnd = content.indexOf('---', metadataStart + 3);
+            // Find the line number of the second '---'
+            let metadataEnd = -1;
+            if (metadataStart !== -1) {
+                const lines = content.split('\n');
+                let dashCount = 0;
+                for (let i = 0; i < lines.length; i++) {
+                    if (lines[i].trim() === '---') {
+                        dashCount++;
+                        if (dashCount === 2) {
+                            metadataEnd = i + 1;
+                            break;
+                        }
+                    }
+                }
+            }
             console.log(metadataStart, metadataEnd);
             reviewBody = `\`\`\`suggestion\n${suggestion}\n\`\`\`\n`;