foo.c: In function 'main':
foo.c:10:2: warning: implicit declaration of function 'fun' [-Wimplicit-function-declaration]
   10 |  fun(s1,n1);
      |  ^~~
foo.c:5:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    5 |  scanf("%d%d",&n1,&n2);
      |  ^~~~~~~~~~~~~~~~~~~~~
foo.c:7:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    7 |   scanf("%d",&s1[i]);
      |   ^~~~~~~~~~~~~~~~~~
foo.c:9:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    9 |   scanf("%d",&s2[j]);
      |   ^~~~~~~~~~~~~~~~~~

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