lib: remove useless file

lib/middleware/cache-common.js

@@ -1,43 +0,0 @@
-const pathToRegExp = require('path-to-regexp');
-
-const paired = (route, path) => {
-    const options = {
-        sensitive: true,
-        strict: true,
-    };
-
-    return pathToRegExp(route, [], options).exec(path);
-};
-
-const validityCheck = (routes, exclude, path) => {
-    let match = false;
-    let routeExpire = false;
-
-    for (let i = 0; i < routes.length; i++) {
-        let route = routes[i];
-
-        if (typeof routes[i] === 'object') {
-            route = routes[i].path;
-            routeExpire = routes[i].expire;
-        }
-
-        if (paired(route, path)) {
-            match = true;
-            break;
-        }
-    }
-
-    for (let j = 0; j < exclude.length; j++) {
-        if (paired(exclude[j], path)) {
-            match = false;
-            break;
-        }
-    }
-
-    return { match, routeExpire };
-};
-
-module.exports = {
-    paired,
-    validityCheck,
-};