Panic while using EnableBasicAuth when odd number of arguments are passed

[coolwednesday]

Describe the bug Index goes out of range when we pass odd number of arguments while using EnableBasicAuth.

To Reproduce

• Create a http server.
• Use EnableBasicAuth and pass odd number of arguments.
• Create a mock request and add encoded authorisation header.
• Hit the request and we can notice the runtime error.

Expected behavior We can just add a simple return statement in the method EnableBasicAuth in gofr.go file.

[coolwednesday]

@Umang01-hash please assign this issue to me.