Solve the programming task below in a Python markdown code block.
According to the new tax scheme, a new tax called the binary string tax was introduced! JJ has a binary string S of length N. According to the tax scheme, for every occurrence of 01 in S, a tax of X rupees will be charged, while for every occurrence of 10 in S, a tax of Y rupees will be charged.

For example, if X = 5, Y = 7 and S = 11010, then S has 1 occurrence of 01 and 2 occurrences of 10, so the tax charged = 5 \cdot 1 + 7 \cdot 2 = 19 

JJ can rearrange the string S in any way he wants. He wants to minimize the amount of tax he has to pay. Can you help him do so?

------ Input Format ------ 

- The first line contains a single integer T - the number of test cases. Then the test cases follow.
- The first line of each test case contains three integers N, X and Y - the length of the binary string S, the tax charged on an occurrence of 01 and the tax charged on an occurrence of 10.
- The second line of each test case contains a binary string S of length N containing 0s and 1s only.

------ Output Format ------ 

For each test case, output the minimum amount of tax that JJ has to pay.

------ Constraints ------ 

$1 ≤ T ≤ 100$
$2 ≤ N ≤ 1000$
$1 ≤X, Y ≤100$

----- Sample Input 1 ------ 
2
4 7 3
1101
5 3 4
00000

----- Sample Output 1 ------ 
3
0

----- explanation 1 ------ 
Test Case 1: JJ can rearrange $S$ to $1110$ for which the tax charged will be $3$ which is the minimum value of tax.

Test Case 2: The tax charged for the string $S = 00000$ is $0$ which can not be reduced further.