build system refresh

rlibc/include/string.h

@@ -0,0 +1,15 @@
+#ifndef RLIBC_STRING_H
+#define RLIBC_STRING_H
+
+#include <stddef.h>
+
+void *memcpy(void *restrict dest, const void *restrict src, size_t n);
+void *memmove(void *dest, const void *src, size_t n);
+void *memset(void *s, int c, size_t n);
+
+size_t strlen(const char *s);
+int strcmp(const char *s1, const char *s2);
+char *strcpy(char *dest, const char *src);
+char* strcat(char *dest, const char* src);
+
+#endif