Kata

Your program will receive an array of complex numbers represented as strings. Your task is to write the complexSum function which have to return the sum as a string.

Complex numbers can be written in the form of a+bi, such as 2-3i where 2 is the real part, 3 is the imaginary part, and i is the "imaginary unit".

When you add two complex numbers, the real and the imaginary part needs to be added separately,so for example 2+3i + 5-i = (2+5)+(3i-i) = 7+2i

Both the complex and the imaginary part can be 0, so 123, -2i or i are also complex numbers.

Complex numbers must be returned in their shortest form, so e.g. 0+1*i should be just i, and 10+0i should be 10. This is also how you will get them!

For simplicity, the coefficients will always be integers. If the array is empty, return 0.

Have fun! :)