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diff --git a/inc/estring.h b/inc/estring.h
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+/**
+ * Copyright (c) 2018, LopeDeVega Research group. All rights reserved.
+ *
+ * Authors:
+ *  Atanas Filipov, it.feel.filipov@gmail.com
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _STRING_H_
+#define	_STRING_H_
+
+#if !defined(NULL)
+    #define NULL ((void*)0)
+#endif
+
+#if !defined(size_t)
+    typedef unsigned long size_t;
+#endif
+
+char * strcat(char * s, const char * append);
+
+char * strncat(char * dst, const char * src, size_t n);
+
+char * strchr(const char * p, int ch);
+
+char * strrchr(const char * p, int c);
+
+int strcmp(const char * s1, const char * s2);
+
+int strncmp(const char * s1, const char * s2, size_t n);
+
+char * strcpy(char * to, const char * from);
+
+char * strncpy(char * dst, const char * src, size_t n);
+
+size_t strlen(const char * s);
+
+char * strpbrk(const char *s1, const char *s2);
+
+char * strsep(char ** stringp, const char * delim);
+
+size_t strspn(const char * s, const char * charset);
+
+size_t strcspn(const char * s, const char * charset);
+
+char * strstr(const char * s, const char * find);
+
+char * strnstr(const char *s, const char *find, size_t slen);
+
+char * strtok(char * s, const char * delim);
+
+char * index(const char * s, int c);
+
+char * rindex(const char * s, int c);
+
+#endif /* _STRING_H_ */