How to ensure a self-defined Function is working properly

[kwfine]

hi all,

I am learning how to write a Function.
I have created a sub named Testing with twenty lines of codes in Excel 2002.
Since some of the codes contains a few lines of duplicate IF and Else statements,
I decided to make use of Function.
Here is the code:

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Since this is my first time writing a Function, I am not sure if
there's anything in the codes that I need to alter or change in the Function.
Please give me some advice and help

Thank you

Kitty