The procedure given below is required to find and replace certain characters…

 The procedure given below is required to find and replace certain characters inside an input character string supplied in array $A$. The characters to be replaced are supplied in array $oldc$, while their respective replacement characters are supplied in array $newc$. Array $A$ has a fixed length of five characters, while arrays $oldc$ and $newc$ contain three characters each. However, the procedure is flawed.

void find_and_replace (char *A, char *oldc, char *newc) {
    for (int i = 0; i < 5; i++)
        for (int j = 0; j < 3; j++)
            if (A[i] == oldc[j])
                A[i] = newc[j];
}

The procedure is tested with the following four test cases.

1. oldc = "abc", newc = "dab"

2. oldc = "cde", newc = "bcd"

3. oldc = "bca", newc = "cda"

4. oldc = "abc", newc = "bac"

If array A is made to hold the string $“abcde”$, which of the above four test cases will be successful in exposing the flaw in this procedure?