First stable conversion from kernel to code proofs

Author: augustepoiroux

lisa-utils/src/main/scala/lisa/fol/FOLHelpers.scala

@@ -120,6 +120,7 @@ object FOLHelpers {
   def asFront(cf: K.ConnectorFormula): Formula =
     cf.label match
       case K.And | K.Or if cf.args.size == 1 => asFront(cf.args(0))
+      case K.And | K.Or => cf.args.map(asFront).reduceLeft((a, b) => asFrontLabel(cf.label)(Seq(a, b))) // TODO: handle this more gracefully
       case _ => asFrontLabel(cf.label).applyUnsafe(cf.args.map(asFront))
   def asFront(bf: K.BinderFormula): BinderFormula =
     asFrontLabel(bf.label).apply(asFrontLabel(bf.bound), asFront(bf.inner))