Fix includes for string.h/string_utils.h

kernel/display.c

@@ -1,3 +1,4 @@
+#include <string.h>
 #include "display.h"
 #include "io.h"
 #include "vga.h"
@@ -62,7 +63,7 @@ void clear_display(void) {
 // Helper function to write a string
 void display_write_string(const char* str) {
     // Use the VGA driver's string writing function
-    vga_write_string(str, my_strlen(str));
+    vga_write_string(str, strlen(str));
 }
 
 // Helper function to print a formatted string

kernel/vga.c

@@ -1,9 +1,9 @@
-#include "vga.h"
 #include <stddef.h>
 #include <stdbool.h>
 #include <string.h>
 #include <stdarg.h>
-#include "klibc/include/string.h"
+#include "string_utils.h"
+#include "vga.h"
 
 void outb(uint16_t port, uint8_t value) {
     __asm__ volatile("outb %0, %1" : : "a"(value), "Nd"(port));