rail, 170 bytes

Result

AC

Duration

1033ms

Code [DL]

$'m'
 -(!x!)(!s!)[]\       #
@---------------(x)0g<
  \---(!x!)s1(x)p(s)---@
$'main'
 -i25mmia(!h!)ii25mmia(!w!)[*](w){m}o[\n\*][ ](w)2s{m}p[*]p(h)2s{m}o[\n\]o[*](w){m}o#

stdin

14
50

stdout

**************************************************
*                                                *
*                                                *
*                                                *
*                                                *
*                                                *
*                                                *
*                                                *
*                                                *
*                                                *
*                                                *
*                                                *
*                                                *
**************************************************

stderr