+#ifndef __LUNAIX_STRING_H
+#define __LUNAIX_STRING_H
+
+#include <stddef.h>
+
+extern size_t strlen(const char* str);
+
+extern size_t strnlen(const char* str, size_t max_len);
+
+extern char* strncpy(char* dest, const char* src, size_t n);
+
+extern const char* strchr(const char* str, int character);
+
+extern char* strcpy(char* dest, const char* src);
+
+extern int strcmp(const char* s1, const char* s2);
+
+#endif /* __LUNAIX_STRING_H */