How to compare arry

please help me

 char seach[]={'a','b','c','d'};
   char str_data[]={'a','b','d','c'};
     for (int z=0;z<4;z++) {
           if (str_data[i] != seach[i]){Serial.println("Arry not qual");}
           else { Serial.println("done equal \n");

give result "Arry not qual" while first two element are same .
my expected result is
done equal
done equal
Arry not qual
Arry not qual

Please post code that compiles and provides the output that you posted

What is i?

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