function getLockedAmount(
    LockedInfo[] memory array,
    address account,
    uint256 amount,
    bool isIncrease
) public pure override returns (uint256) {
    if (array.length == 0) return 0;

    uint256 newLockedAmount;
    if (isIncrease) {
        ...
    } else {
        for (uint256 i = 0; i < array.length; i++) {
            if (array[i].lockedAmount > amount) {
                newLockedAmount = array[i].lockedAmount - 1;
            } else {
                newLockedAmount = 0;
            }

            if (account == array[i].staker) {
                return newLockedAmount;
            }
        }
    }

    return 0;
}
