Fixed issues with category routes and worked on post routes

public/consts.js

@@ -1 +1,24 @@
-const backendURL = "http://127.0.0.1:8080";
+const backendURL = "http://127.0.0.1:8080";
+
+function setCookie(cname, cvalue, exdays) {
+    const d = new Date();
+    d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
+    let expires = "expires=" + d.toUTCString();
+    document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
+}
+
+function getCookie(cname) {
+    let name = cname + "=";
+    let decodedCookie = decodeURIComponent(document.cookie);
+    let ca = decodedCookie.split(';');
+    for (let i = 0; i < ca.length; i++) {
+        let c = ca[i];
+        while (c.charAt(0) == ' ') {
+            c = c.substring(1);
+        }
+        if (c.indexOf(name) == 0) {
+            return c.substring(name.length, c.length);
+        }
+    }
+    return "";
+}