Wrong names for enum constants

[CaelmBleidd]

Description

It seems like we have a mistake in enum constants name generation. If we have a code that returns a name for an enum constant, it will return an empty line. Moreover, if we try to check whether this name is equal to some line, it will never be true

To Reproduce

Steps to reproduce the behavior:

Example:

1. Run generation for org.utbot.examples.enums.ClassWithEnum#checkName
2. Check the results

Expected behavior

Correctly generated three branches with correct returned names.

Actual behavior

Something strange like two results or empty lines in them are generated.

Visual proofs (screenshots, logs, images)

    public String checkName(String s) {
        final String name = READY.name();
        if (s.equals(name)) {
            return ERROR.name();
        }

        return READY.name();
    }

Environment

There is no specific environment.

Additional context

There is no additional context.

[tyuldashev]

Could it be a reason for #1588?