🚑️ fix(engine): fix the pagination code for `duckduckgo` engine (#468)

src/engines/duckduckgo.rs

@@ -51,15 +51,14 @@ impl SearchEngine for DuckDuckGo {
         // Page number can be missing or empty string and so appropriate handling is required
         // so that upstream server recieves valid page number.
         let url: String = match page {
-            1 | 0 => {
+            0 => {
                 format!("https://html.duckduckgo.com/html/?q={query}&s=&dc=&v=1&o=json&api=/d.js")
             }
             _ => {
                 format!(
-                    "https://duckduckgo.com/html/?q={}&s={}&dc={}&v=1&o=json&api=/d.js",
-                    query,
-                    (page / 2 + (page % 2)) * 30,
-                    (page / 2 + (page % 2)) * 30 + 1
+                    "https://duckduckgo.com/html/?q={query}&s={}&dc={}&v=1&o=json&api=/d.js",
+                    page * 30,
+                    page * 30 + 1
                 )
             }
         };