Complex Number Multiplication
To multiply two complex numbers, we can use the distributive property. If we have two complex numbers ( a + bi ) and ( c + di ), their product will be ( ac + adi + bci  bd ), as ( i^2 = 1 ).
We can extract the real and imaginary parts of the given strings and perform the multiplication. Here’s how we can do it:


Explanation:
 We first split the given strings into the real and imaginary parts, and convert them to integers.
 We then compute the real part of the product by multiplying the real parts and subtracting the product of the imaginary parts.
 We compute the imaginary part of the product by multiplying the real part of one number with the imaginary part of the other and adding the results.
 Finally, we format the result as a string and return it.