* close test(utils): more test for Collection.ts #2793
* fix: after each not defined
* close test(utils): more test for base64.ts #2796
* close test(utils): more test for casing.ts #2797
* test(utils): remove dev code
* close#2799
* fix#2800
* close#2823
* test(utils): fix site move
* close#2826
* refactor(utils): remove redundant if
* close#2827
* close#2828