foo.c: In function 'main':
foo.c:11:40: warning: array subscript 100 is above array bounds of 'char[100]' [-Warray-bounds]
   11 |         {if(str[j]==str[i]){total++;str[100]=str[i];}
      |                                     ~~~^~~~~
foo.c:5:10: note: while referencing 'str'
    5 |     char str[100]={0};
      |          ^~~

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