added merge pdfs, fixed jpgstopdf arg issues,

sample_tests/sample_test.json

@@ -0,0 +1,32 @@
+[
+    {
+        "Name": "Alice",
+        "Age": "25",
+        "Email": "alice@example.com",
+        "Score": "88.5"
+    },
+    {
+        "Name": "Bob",
+        "Age": "30",
+        "Email": "bob@example.com",
+        "Score": "92.3"
+    },
+    {
+        "Name": "Charlie",
+        "Age": "35",
+        "Email": "charlie@example.com",
+        "Score": "79.0"
+    },
+    {
+        "Name": "David",
+        "Age": "40",
+        "Email": "david@example.com",
+        "Score": "85.4"
+    },
+    {
+        "Name": "Eve",
+        "Age": "28",
+        "Email": "eve@example.com",
+        "Score": "91.2"
+    }
+]