refactor: optimize imports

Author: kelvin-olaiya

src/test/scala/io/github/kelvindev15/engine/TestBuiltins.scala

@@ -2,7 +2,6 @@ package io.github.kelvindev15.engine
 
 import io.github.kelvindev15.engine.utils.TestUtils
 import io.github.kelvindev15.prolog.PrologProgram
-import io.github.kelvindev15.prolog.core.{PrologList, Struct}
 import io.github.kelvindev15.prolog.dsl.{DeclarativeDSL, PrologDSL}
 import io.github.kelvindev15.prolog.engine.Solver
 import io.github.kelvindev15.prolog.engine.Solver.Solution