Finished Part I, moved part 2 relavent files to own folder.

Part2/A4/08_shell/kernel/kernel.c

@@ -0,0 +1,22 @@
+#include "../cpu/isr.h"
+#include "../drivers/screen.h"
+#include "kernel.h"
+#include "../libc/string.h"
+
+void _start() {
+    isr_install();
+    irq_install();
+
+    kprint("Type something, it will go through the kernel\n"
+        "Type END to halt the CPU\n> ");
+}
+
+void user_input(char *input) {
+    if (strcmp(input, "END") == 0) {
+        kprint("Stopping the CPU. Bye!\n");
+        asm volatile("hlt");
+    }
+    kprint("You said: ");
+    kprint(input);
+    kprint("\n> ");
+}

Part2/A4/08_shell/kernel/kernel.h

@@ -0,0 +1,6 @@
+#ifndef KERNEL_H
+#define KERNEL_H
+
+void user_input(char *input);
+
+#endif