@Nullable
      private static PsiLocalVariable extractDelimiterVar(@NotNull PsiAssignmentExpression assignmentExpression) {
        PsiLocalVariable delimiterVar = resolveLocalVariable(assignmentExpression.getLExpression());
        if (delimiterVar == null) return null;
        PsiType delimiterVarType = delimiterVar.getType();
        if (!delimiterVarType.equalsToText(CommonClassNames.JAVA_LANG_STRING)) return null;
        PsiExpression initializer = delimiterVar.getInitializer();
        if (initializer == null) return null;
        Object constantExpression = ExpressionUtils.computeConstantExpression(initializer);
        if (!"".equals(constantExpression)) return null;
        return delimiterVar;
      }
@Nullable
      private static PsiLocalVariable extractDelimiterVar(@NotNull PsiAssignmentExpression assignmentExpression)