feat: Vfs and Ext2 support. Code style/attribute improvements

Added VFS and Ext2 support.
Optimized attributes of methods to improve code highlighting.
Printf attribute, malloc attribute, etc.

rootfs/umount_rootfsh.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+function log() {
+  echo "$*"
+}
+
+LB_DEV=$(findmnt -n -o SOURCE mnt)
+
+if [ -z "${LB_DEV}" ]; then
+  log "Not mounted"
+  exit 1
+fi
+
+sudo umount mnt
+sudo losetup -d "${LB_DEV%p1}"