public static void removeBackSlash(PsiElement parent) {
    if (parent != null) {
      Stack<PsiElement> stack = new Stack<>();
      if (parent instanceof PyParenthesizedExpression)
        stack.push(((PyParenthesizedExpression)parent).getContainedExpression());
      else
        stack.push(parent);
      while (!stack.isEmpty()) {
        PsiElement el = stack.pop();
        PsiWhiteSpace[] children = PsiTreeUtil.getChildrenOfType(el, PsiWhiteSpace.class);
        if (children != null) {
          for (PsiWhiteSpace ws : children) {
            if (ws.getText().contains("\\")) {
              ws.delete();
            }
          }
        }
        for (PsiElement psiElement : el.getChildren()) {
          stack.push(psiElement);
        }
      }
    }
  }
public static void removeBackSlash(PsiElement parent)