init commit

src/string/memset.c

@@ -0,0 +1,9 @@
+#include <string.h>
+
+void *memset(void *dest, int c, size_t n)
+{
+    unsigned char *d = dest;
+    for (size_t i = 0; i < n; i++)
+        d[i] = (unsigned char)c;
+    return dest;
+}