Remove returns strings

[Cupnfish]

Removes parameters that are not necessary.
Disadvantages:

• The type_name method does not currently have stable const.
• The value returned by type_name is not necessarily the shortest string, for example type_name::<Option<String>>() may return Option<String> or std::option::Option<std::string::String>.
• Also the returned value will vary with different versions of the compiler.

Advantages:

• Reduces unnecessary parameter input, which when calling a method will make the caller believe that the return value specified within the parameter has some relationship to the output return value, when in fact the return value entered within the parameter is only useful as a diagnostic for error output. The documentation of type_name within std, on the other hand, is meant to be used for code diagnostic purposes.
• The interface to call would be more clean.

[niklasad1]

nice one, LGTM