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extract-value ket
extract the value, ie, remove the category, from the given ket
categories are separated by ": "
with the most general category on the left, and the most specific on the right
for example |animal: mammal: dog>
has the most general category "animal", then the category "mammal" and then finally the "value" dog
categories can be considered a type for the object
and values are specific examples of that type
Eg, |food: apple> says apple is a type of food, and the value of |food: apple> is apple

-- if there is no category, then return unchanged:
extract-value |dog>
    |dog>

extract-value |animal: mammal: dog>
    |dog>

-- an abstract example:
extract-value |a: b: c: d: e: f>
    |f>