Fix: filename and code typo (#260)
* Rename handller.go to handler.go
* Rename handller.go to handler.go
* Rename handller_test.go to handler_test.go
* Rename handller.go to handler.go
* Rename handller.go to handler.go
* Rename handller.go to handler.go
* Rename handller.go to handler.go
* Fix typo
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