Functions deletelistresult, deletewordresult, addlistresult, addwordresult should be exported from the src/external/redux/helpers file.
deleteListResult must get a state and list to delete as arguments.
This method must return the updated state, filtering the lists LISTS and WORDS.
LISTS must be filtered by the element’s key property, WORDS - by listKey.
deleteWordResult should receive a state and word for removal as arguments.
This method must return the updated state by filtering the WORDS list on the element’s word field.
The addListResult must get a state and list to add as arguments.
If the list already exists, you need to update only the error field - There is already a list with this name.
If the list name is not or it is an empty string - the error is List name is empty.
The addWordResult method should receive a state and word object to add as arguments.
If the word in the word property already exists in the list - the error is This word is already there.
Also update the LISTS And WORDS values in Async Storage for each change.

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