Look again at the link you posted. The link call does not connect to a link out (or the link in).
Think about why it's called "link call" - it "calls" to a link.
Flow 1
Inject/whatever ->link call->debug/whatever
Flow 2
Link in -> your nodes -> link out/return
Example: HowTo define and use global utillity function in V3.x and higher - #2 by Steve-Mcl
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