diff --git a/kernel/kernel.c b/kernel/kernel.c
index 46ba5d0..56cd91b 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -1,5 +1,6 @@
 #include <khal.h>
 #include <kstdint.h>
+#include <kstring.h>
 
 int multiboot2_init(uint64_t *addr, uint32_t magic);
 
@@ -14,6 +15,18 @@ void kernel_main64(uint64_t *multiboot2, uint32_t magic, void *esp, uint64_t bas
 	} else {
 		serial_printf("[ERR]\n");
 	}
-
+	char *str1 = "ABCF";
+	char *str2 = "ABCD";
+	char buf[7] = "";
+	auto cmp_value = strcmp(str1, str2);
+	
+	serial_printf("[LOG] STR1 AND STR2 CMP %d\n", cmp_value);
+	serial_printf("[LOG] STR1 LEN %d\n", strlen(str1));
+	strcpy((char*)&buf, str1); 
+	serial_printf("[LOG] STRCPY RESULT: %s\n", buf);
+	serial_printf("[LOG] STRCPY RESULT LEN %d\n", strlen(buf));
+	strcat((char*)&buf, "CAT");
+	serial_printf("[LOG] STRCAT RESULT: %s\n", buf);
+	serial_printf("[LOG] STRCAT RESULT LEN %d\n", strlen(buf));
 	for (;;) {}
-}
\ No newline at end of file
+}
diff --git a/kernel/klibc/printf.c b/kernel/klibc/printf.c
index 315c149..7b2885d 100644
--- a/kernel/klibc/printf.c
+++ b/kernel/klibc/printf.c
@@ -77,4 +77,4 @@ void serial_printf(const char *fmt, ...) {
         }
     }
     va_end(args);
-}
\ No newline at end of file
+}