Refactor code into utils, mfapi and mfshell

- utils is the low level library used by the others
 - mfapi uses utils and implements the api and some wrappers
 - mfshell uses mfapi and utils to provide a shell

utils/strings.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2013 Bryan Christ <bryan.christ@mediafire.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2, as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ */
+
+
+#ifndef _STR_TOOLS_H_
+#define _STR_TOOLS_H_
+
+#include <stdint.h>
+
+char*       strdup_printf(char* fmt, ...);
+
+char*       strdup_join(char *string1,char *string2);
+
+char*       strdup_subst(char *string,char *str_old,char *str_new,int max);
+
+void        string_chomp(char *string);
+
+// void        string_strip_head(char *string,char c);
+
+// void        string_strip_tail(char *string,char c);
+
+#endif