If I create a text string which contains squeak code, how can I execute it from within a script?

Folks,

I am trying to create a project where kids can enter their own "Connector"
functions.

So what I want to do is given a connector connected to two text boxes (one
Enhanced Text, so I can execute a script when they hit <CR> or on <focus
loss>).
I have a string variable defined for the connector, in which the kids can
enter a function like ( D = S + 25)
Where D maps to DestinationPlayer and S maps to SourcePlayer.

Ideally I would like to generate the below script and execute it:

doIt
self getDestinationPlayer setNumericValue: self getSourcePlayer
getNumericValue + 25



Need some squeak coding help on this.  I guess specifically, assuming I can
figure out how to create a string with the correct code ...
How do I "do it" to the string?

Thanks,
Stephen

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