{
    "Function": "removeCollateral",
    "File": "contracts/src/CollateralRegistry.sol",
    "Parent Contracts": [
        "contracts/src/Interfaces/ICollateralRegistry.sol",
        "contracts/src/Dependencies/Owned.sol",
        "contracts/src/Interfaces/IOwned.sol"
    ],
    "High-Level Calls": [
        "ITroveManager"
    ],
    "Internal Calls": [
        "require(bool,string)",
        "require(bool,string)",
        "require(bool,string)",
        "onlyOwner"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function removeCollateral(uint256 index) external override onlyOwner {\n        // remove collaterals and trove managers\n        require(index <= 9, \"Invalid index\");\n        require(address(collateralTokens[index]) != address(0), \"Branch not initialised\");\n\n        ITroveManager troveManager = ITroveManager(troveManagers[index]);\n\n        // revert if branch is not shutdown\n        require(troveManager.shutdownTime() != 0, \"Branch is not shutdown\");\n\n        emit CollateralRemoved(address(collateralTokens[index]), address(troveManagers[index]));\n\n        // push the zero element at the end\n        uint256 swapIndex = totalCollaterals - 1;\n        if (swapIndex > index) {\n            // swap\n            collateralTokens[index] = collateralTokens[swapIndex];\n            troveManagers[index] = ITroveManager(troveManagers[swapIndex]);\n\n            collateralTokens[swapIndex] = IERC20Metadata(address(0));\n            troveManagers[swapIndex] = ITroveManager(address(0));\n        } else {\n            // no swap. deleted index is the last in the array\n            collateralTokens[index] = IERC20Metadata(address(0));\n            troveManagers[index] = ITroveManager(address(0));\n        }\n\n        totalCollaterals--;\n    }"
}