/**
     * Gives specified permission to certain player
     *
     * @param uuid - player uuid to give permission
     * @param permission - specified to give perm
     */
public synchronized void givePermission(UUID uuid, String permission) {
        userManager.modifyUser(uuid, user -> user.data().add(Node.builder(permission).build()));
    }

/**
     * Takes permissions from player
     *
     * @param uuid - from whom to take permission
     * @param permissions - permission which will be deleted
     */
    public synchronized void takePermissions(UUID uuid, String[] permissions) {
        for (String permission : permissions)
            takePermission(uuid, permission);
    }

    /**
     * Takes specified permission from player
     *
     * @param uuid - from whom to take permission
     * @param permission - specified to delete perm
     */
    public synchronized void takePermission(UUID uuid, String permission) {
        userManager.modifyUser(uuid, user -> {
            //get result of remove operation
            DataMutateResult mutateResult = user.data().remove(Node.builder(permission).build());
            //if the result is not successful, then repeat the operation until it becomes successful. (hardcode enabled xD)
            if (!mutateResult.wasSuccessful()) {
                takePermission(uuid, permission);
            }
        });
    }