Walk.java:36-38: refactor this interface and classes...

[0pdd]

The puzzle 39-efbdd83b from #39 has to be resolved:

speco/src/main/java/org/eolang/speco/Walk.java

Lines 36 to 38 in 7ad77c1

	* @todo #39:60min refactor this interface and classes EoWalk and XmirWalk implementing it,
	* to avoid code duplication. In particular, in the fields (input, output and speco),
	* constructor and exec method.

The puzzle was created by @rultor on 13-Apr-23.

Estimate: 60 minutes, role: DEV.

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