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

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

lib/string/stpeprintf.c

@@ -0,0 +1,25 @@
+/*
+ * SPDX-FileCopyrightText:  2022 - 2023, Alejandro Colomar <alx@kernel.org>
+ *
+ * SPDX-License-Identifier:  BSD-3-Clause
+ */
+
+
+#include <config.h>
+
+#if !defined(HAVE_STPEPRINTF)
+
+#ident "$Id$"
+
+#include "string/stpeprintf.h"
+
+#include <stdarg.h>
+
+
+extern inline char *stpeprintf(char *dst, char *end, const char *restrict fmt,
+    ...);
+extern inline char *vstpeprintf(char *dst, char *end, const char *restrict fmt,
+    va_list ap);
+
+
+#endif  // !HAVE_STPEPRINTF