Exercise: Combine lists

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examples/files/a.txt

Tomato=78
Avocado=23
Pumpkin=100

examples/files/b.txt

Cucumber=17
Avocado=10
Cucumber=10

Write a script called combine_lists.py that takes the two files and combines them adding the values for each vegetable. The expected result is:

examples/files/c.txt

Avocado=33
Cucumber=27
Pumpkin=100
Tomato=78