Create _c.py

Update _c.py

tests/_c.py

@@ -0,0 +1,12 @@
+from c import *
+
+p = malloc(10 * sizeof(int32))
+p = cast(p, int32)
+
+for i in range(10):
+    p[i] = i
+
+for i in range(10):
+    assert p[i] == i
+
+free(p)