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A mixture of good and bad? Or rather a separation between good and bad?

"There was light and God saw that the light was good and He separated the light from the darkness" Genesis 1

"I form the light, and create darkness: I make peace, and create evil: I the LORD do all these [things]." Isaiah 45:7

How does a GOOD God "create evil"? By forming the light (that is good) and separating it from the darkness. What God does is "form" light and "make" peace, then he "separates" it from the darkness. This "creates" darkness and "creates" evil. Rather than calling Him a creator it's more fitting to call him a FORMER or MAKER or SEPARATOR.