s390-tools: Move function util_strstrip

This patch
 - moves function util_strstrip to libutil/util_libc.c and deletes the
   extra files util_strstip.[ch]
 - adds doxygen comments for util_strstrip()
 - provides an example on how to use util_strstrip().

Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

include/lib/util_libc.h

@@ -14,6 +14,10 @@
 
 #include <stdio.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * Allocate memory or panic in case of failure
  *
@@ -125,4 +129,10 @@ int __util_vsprintf(const char *func, const char *file, int line,
 char *util_strcat_realloc(char *str1, const char *str2);
 void util_str_toupper(char *str);
 
+char *util_strstrip(char *s);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /** LIB_UTIL_LIBC_H @} */

include/lib/util_str.h

@@ -1,25 +0,0 @@
-/**
- * @defgroup util_str
- * @{
- * @brief Strip leading and trailing blanks
- *
- * Copyright IBM Corp. 2018
- *
- * s390-tools is free software; you can redistribute it and/or modify
- * it under the terms of the MIT license. See LICENSE for details.
- */
-
-#ifndef LIB_UTIL_STR_H
-#define LIB_UTIL_STR_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-char *util_strstrip(char *s);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /** LIB_UTIL_STRSTRIP_H @} */