File: main.c

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

int __VERIFIER_nondet_int();

  char x[100], y[100];
  int i,j,k;

void main() {
  k = __VERIFIER_nondet_int();

  i = 0;
  while(x[i] != 0){
    y[i] = x[i];
    i++;
  }
  y[i] = 0;

  if(k >= 0 && k < i)
    if(y[k] == 0)
      {ERROR: __VERIFIER_error();}
}