The Recipe Doubler

Grandma's recipe feeds 4 — tonight you're feeding a small army. 👵

You get the recipe as ingredient:amount pairs and a factor to multiply by. Print the scaled recipe in the same order, same format, comma-separated.

Example:

Input: pairs = "flour:2,sugar:1,eggs:3", factor = 2 Output: flour:4,sugar:2,eggs:6

Each amount gets multiplied by 2 while the ingredient names and their order stay exactly the same.