Complex Number Multiplication

Calculate the product of two complex numbers represented as strings in the form “A+Bi”. Here, ‘A’ represents the real part, and ‘B’ represents the imaginary part.

Explanation

You will be given two complex numbers as strings, 'NUM1' and 'NUM2'. Your task is to find their product and return it in the same string format "A+Bi", where ‘A’ is the real part and ‘B’ is the imaginary part of the result.

Input:

The first line contains an integer ‘T’ representing the number of test cases. Each test case consists of two lines:
 - The first line contains the string representing the first complex number 'NUM1'.
 - The second line contains the string representing the second complex number 'NUM2'.

Output:

For each test case, return the result of the complex multiplication as a string in the form "A+Bi".

Example:

Input:

T = 1
NUM1 = "1+1i"
NUM2 = "1+1i"

Output:

-0+2i

Constraints:

• 1 ≤ T ≤ 105
• -107 ≤ A, B ≤ 107
• Time Limit: 1 sec

Note:

Printing is not required; focus on implementing the function that processes the logic and returns the result.