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I have given suggestions on how to proceed with both issues in the OP. If you and your friend do not understand the suggestions then I am afraid you need more help than what is normally provided on a...

1) If something is being added twice, then the code says to add it twice. Filter through the code to see how many times it is added. Use printlns to determine when and how many times a block of code...

Welcome ayyappad

Please post the code to the forum and not as an attachment so people can see the code without the process of downloading and opening etc
Please use code tags, assistance can be...