refactor: use a performant alternative to build the '/' route

Author: thetutlage

src/router/lookup_store/url_builder.ts

@@ -110,8 +110,7 @@ export class UrlBuilder {
        * we must break out from the loop
        */
       if (token.type === 0) {
-        const value = token.val.startsWith('/') ? token.val.substring(1) : token.val
-        uriSegments.push(`${value}${token.end}`)
+        uriSegments.push(token.val === '/' ? '' : `${token.val}${token.end}`)
       } else if (token.type === 2) {
         const values: string[] = paramsArray ? paramsArray.slice(paramsIndex) : paramsObject['*']
         this.#ensureHasWildCardValues(pattern, values)