File: main.c

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extern void __VERIFIER_error() __attribute__ ((__noreturn__));

void __VERIFIER_assert(int cond) {
  if (!(cond)) {
    ERROR: __VERIFIER_error();
  }
  return;
}
char __VERIFIER_nondet_char();

int main() {
    unsigned int max = 5;
    char str1[max], str2[max];
    int i, j;

    for (i=0; i<max; i++) {
        str1[i]=__VERIFIER_nondet_char();
    }

    str1[max-1]= '\0';

    j = 0;

    for (i = max - 1; i >= 0; i--) {
        str2[j] = str1[i];
        j++;
    }

    j = max-1;
    for (i=0; i<max; i++) {
      __VERIFIER_assert(str1[i] == str2[j]);
      j--;
    }
}