In Nouns^x, Exclamation marks^x, Colons^x

Hello, friends. Please, which is the correct way and why? Doubt #1 "color of the car" x "car color" x "car's color" "leg of the cat" x "cat leg" x "cat's leg" "pizza of yesterday" x "yesterday pizza" x "yesterday's pizza" I've heard that Genitive Case is used only with nouns which are "living...

Well, both or neither, really, because "rules" governing punctuation aren't really "rules" in the sense that rules govening nouns, verbs and adjectives are rules. Punctuation "rules" vary considerably, often from publisher to publisher, or from newspaper to newspaper. I can tell you that...