#include <stdio.h>
int main(void) {
char a[]= "helablo";
int i, j;
for(j = i = 0; a[i]; ++i){
if(a[i] == 'a' && a[i+1] == 'b'){
a[j++] = 'c';
++i;
} else {
a[j++] = a[i];
}
}
a[j] = '\0';
return 0;
}
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