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14. Splitting and Merging Coins

sui::coin::split and sui::coin::join.

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Coin objects are discrete balances. To pay exact sums, transactions split a balance using `coin::split(&mut coin, amount, ctx)` or combine balances using `coin::join(&mut primary_coin, secondary_coin)`.

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Check your understanding

1. How do you combine two Coin<SUI> objects into one?
coin::join(&mut primary, secondary)primary + secondarycoin::merge(primary, secondary)coin::combine(primary)
2. What does coin::split do?
Deducts an amount from an existing coin and mints a fresh Coin object containing that amountHalves the balanceDeletes the coinSends coin to validator

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