[Feature Request]: High cyclomatic complexity leds to bad readability #295

Feature description

There are some functions that are highly complex and hard to read:

                         name cyclocomp
13         extract_occurrence        30
12         extract_dependency        13
33 move_functions_after_arrow        10
30                 lang2calls         7
5                      c.qenv         6
17       fix_shifted_comments         6

It would be good to make it easier to read the extract_dependency and extract_occurrence so that it is easier to modify them and fix any error.

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