Return values to another sheet if a cell is not empty, otherwise skip to next cell

Question

I have one sheet with a list of phone extensions in which some have names associated with them and some do not. I am trying to use a function to display one the extensions with names onto another sheet, but I can't wrap my head around the correct formula. I've tried to use the isblank function or the len function, but it doesn't seem to work the way I want. If anyone has any advice on how to make this work without using dozens of if statements, I would appreciate the help.

Here is a link to a practice sheet I am using (Edited to a public sheet): https://docs.google.com/spreadsheets/d/e/2PACX-1vQz4seYTcXraVkjMI2FJrLu0xRfdTEc6Fef-OESWbKwuPw_HHu4gy4Dyzk_4HvVQQbXeW5Hjbhhf5KO/pubhtml

Answer 1

=QUERY(Sheet1!A1:C, "where A is not null", 1)

---

=QUERY(Sheet1!A1:C, "select C where A is not null", 1)

Answer 2

=FILTER(Sheet1!A1:C, A1:A<>"")

---

=FILTER(Sheet1!C1:C, A1:A<>"")