lib/string/: Move string-related files to string/ subdir

Signed-off-by: Alejandro Colomar <alx@kernel.org>

lib/string/strncpy.h

@@ -0,0 +1,21 @@
+/*
+ * SPDX-FileCopyrightText: 2023, Alejandro Colomar <alx@kernel.org>
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+
+#ifndef SHADOW_INCLUDE_LIB_STRNCPY_H_
+#define SHADOW_INCLUDE_LIB_STRNCPY_H_
+
+
+#include <config.h>
+
+#include <string.h>
+
+#include "sizeof.h"
+
+
+#define STRNCPY(dst, src)  strncpy(dst, src, NITEMS(dst))
+
+
+#endif  // include guard