diff --git a/src/drivers/uart.c b/src/drivers/uart.c
index a2c216a..df5d4fd 100644
--- a/src/drivers/uart.c
+++ b/src/drivers/uart.c
@@ -137,7 +137,8 @@ void kprintf_internal(const char *format, va_list args)
 		if (*p == '%')
 		{
 			p++;
-			if(*p == '\0') break;
+			if (*p == '\0')
+				break;
 			switch (*p)
 			{
 			case 'c':
@@ -149,7 +150,8 @@ void kprintf_internal(const char *format, va_list args)
 			case 's':
 			{
 				char *s = va_arg(args, char *);
-				if (!s) s = "(null)";
+				if (!s)
+					s = "(null)";
 				kprint(s);
 				break;
 			}
@@ -159,12 +161,12 @@ void kprintf_internal(const char *format, va_list args)
 				kprint_int(d);
 				break;
 			}
-	        case 'u':
-			{ 
+			case 'u':
+			{
 				unsigned int u = va_arg(args, unsigned int);
 				kprint_int((int)u);
 				break;
-        	}
+			}
 			case 'f':
 			{
 				double f = va_arg(args, double);
@@ -174,11 +176,11 @@ void kprintf_internal(const char *format, va_list args)
 			case 'x': // Hex
 			case 'p': // Pointer
 			{
-				#if UINTPTR_MAX == 0xffffffffULL
-					unsigned int x = va_arg(args, unsigned int);
-				#else
-					uint64_t x = va_arg(args, uint64_t);
-				#endif
+#if UINTPTR_MAX == 0xffffffffULL
+				unsigned int x = va_arg(args, unsigned int);
+#else
+				uint64_t x = va_arg(args, uint64_t);
+#endif
 				kprint_hex(x);
 				break;
 			}
diff --git a/src/lib/string.h b/src/lib/string.h
index 78ae169..5ad4eee 100644
--- a/src/lib/string.h
+++ b/src/lib/string.h
@@ -2,5 +2,8 @@
 #define STRING_H
 
 void *memset(void *s, int c, size_t n);
+void *memcpy(void *dest, const void *src, size_t n);
+int strcmp(const char *str1, const char *str2);
+size_t strlen(const char *s);
 
 #endif
\ No newline at end of file