foo.c: In function 'main':
foo.c:18:28: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   18 |                         if(a[i]='\0')
      |                            ^
foo.c:9:21: warning: unused variable 'i' [-Wunused-variable]
    9 |         int x=0;int i=0;
      |                     ^

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