c-gcc, 100 bytes

Result

AC

Duration

997ms

Code [DL]

y,i,j;main(x){for(scanf("%d%d",&y,&x);i<y;++i)for(j=0;j<x;++j)printf(j%~-x&&i%~-y?" ":j?"*":"\n*");}

stdin

41
53

stdout

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

stderr

/tmp/code.c:1:1: warning: data definition has no type or storage class
 y,i,j;main(x){for(scanf("%d%d",&y,&x);i<y;++i)for(j=0;j<x;++j)printf(j%~-x&&i%~-y?" ":j?"*":"\n*");}
 ^
/tmp/code.c:1:1: warning: type defaults to 'int' in declaration of 'y' [-Wimplicit-int]
/tmp/code.c:1:3: warning: type defaults to 'int' in declaration of 'i' [-Wimplicit-int]
 y,i,j;main(x){for(scanf("%d%d",&y,&x);i<y;++i)for(j=0;j<x;++j)printf(j%~-x&&i%~-y?" ":j?"*":"\n*");}
   ^
/tmp/code.c:1:5: warning: type defaults to 'int' in declaration of 'j' [-Wimplicit-int]
 y,i,j;main(x){for(scanf("%d%d",&y,&x);i<y;++i)for(j=0;j<x;++j)printf(j%~-x&&i%~-y?" ":j?"*":"\n*");}
     ^
/tmp/code.c:1:7: warning: return type defaults to 'int' [-Wimplicit-int]
 y,i,j;main(x){for(scanf("%d%d",&y,&x);i<y;++i)for(j=0;j<x;++j)printf(j%~-x&&i%~-y?" ":j?"*":"\n*");}
       ^~~~
/tmp/code.c: In function 'main':
/tmp/code.c:1:7: warning: type of 'x' defaults to 'int' [-Wimplicit-int]
/tmp/code.c:1:19: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
 y,i,j;main(x){for(scanf("%d%d",&y,&x);i<y;++i)for(j=0;j<x;++j)printf(j%~-x&&i%~-y?" ":j?"*":"\n*");}
                   ^~~~~
/tmp/code.c:1:19: warning: incompatible implicit declaration of built-in function 'scanf'
/tmp/code.c:1:19: note: include '<stdio.h>' or provide a declaration of 'scanf'
+#include <stdio.h>
 y,i,j;main(x){for(scanf("%d%d",&y,&x);i<y;++i)for(j=0;j<x;++j)printf(j%~-x&&i%~-y?" ":j?"*":"\n*");}
                   ^~~~~
/tmp/code.c:1:63: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
 y,i,j;main(x){for(scanf("%d%d",&y,&x);i<y;++i)for(j=0;j<x;++j)printf(j%~-x&&i%~-y?" ":j?"*":"\n*");}
                                                               ^~~~~~
/tmp/code.c:1:63: warning: incompatible implicit declaration of built-in function 'printf'
/tmp/code.c:1:63: note: include '<stdio.h>' or provide a declaration of 'printf'