#IBM/Lotus Notes Formula, 54 bytes

c:=@Explode(b);@Trim(@If(@Begins(c;a);@Right(c;a);""))

Takes it's input from two fields named a and b. Works because Formula will recursively apply a function to a list without the need for a @For loop.

No TIO available so here's a screenshot:

enter image description here

IBM/Lotus Notes Formula, 54 bytes

c:=@Explode(b);@Trim(@If(@Begins(c;a);@Right(c;a);""))

Takes it's input from two fields named a and b. Works because Formula will recursively apply a function to a list without the need for a @For loop.

No TIO available so here's a screenshot:

enter image description here