Fix for 6786 removeZeroCoins mutates original slice #6811
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Description
This PR introduces two new unit test cases, one for Coin and one for DecCoin that fail on the existing code base in order to demonstrate the manipulation of the source array as described. The modifications to the Coin and DecCoin 'remove zero balance coin' functions address these issues and make the two added tests pass successfully.
closes: #6786
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