Decamel is pre-implemented and default formatter to produce human readable error strings from function names.

DecamelAndRmTryPrefix is pre-implemented formatter to produce human readable error strings from function names.

Noop is preimplemented formatter that does nothing to function name.

Formatter is a helper struct which wraps the actual formatting function which is called during the function name processing to produce errors automatically.

Interface is a formatter interface.

DoFmt is a helper function type which allows reuse Formatter struct for the implementations.