Multicolumn Explode

I am trying to turn multiple columns into a single column, without the "null" ones and keep the identifier of each row

Identifier	Column1	Column2	Column3	Column4
1	Dog	Cow	Sheep	Dinosaur
2	Dog	Pig
3	Bull	Cow	Elephant

I want the new 2 columns like this, the original dataframe might have lots of columns, 20, 30, maybe more.

Identifier	Var
1	Dog
1	Cow
1	Sheep
1	Dinosaur
2	Dog
2	Pig
3	Bull
3	Cow
3	Elephant

source https://stackoverflow.com/questions/72748489/multicolumn-explode

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