Implemented some basic libc functions and a text console

libc/string/memset.c

@@ -0,0 +1,13 @@
+#include <stddef.h>
+
+void *memset(void *str, int c, size_t n)
+{
+    unsigned char val = (unsigned char)c;
+    unsigned char *buf = str;
+
+    for (size_t i = 0; i < n; i++) {
+        buf[i] = val;
+    }
+
+    return str;
+}