Add basic support for vertical problem splitting

Author: Hitesh Paul

autoload/leetcode.vim

@@ -527,7 +527,7 @@ function! s:HandleProblemListCR() abort
         let problem = s:GetProblem(problem_id)
         let problem_slug = problem['slug']
         let problem_ext = s:SolutionFileExt(g:leetcode_solution_filetype)
-        let problem_file_name = printf('%s.%s.%s', problem_id,
+        let problem_file_name = printf('[DESC] %s.%s.%s', problem_id,
                     \  s:SlugToFileName(problem_slug),
                     \ problem_ext)
 
@@ -720,9 +720,19 @@ function! leetcode#ResetSolution(with_latest_submission) abort
     endfor
     call add(output, s:CommentEnd(filetype))
     call append('$', output)
-
     silent! normal! gggqG
 
+    let problem_ext = s:SolutionFileExt(g:leetcode_solution_filetype)
+    " TODO avoid recalculation of problem_ext twice
+    let problem_new_file_name = printf('%s.%s.%s', problem['id'], problem_slug, problem_ext)
+    if buflisted(problem_file_name)
+        execute bufnr(problem_new_file_name) . 'buffer'
+        return
+    endif
+
+    execute 'rightbelow new ' . problem_new_file_name
+
+
     call append('$', code)
 
     silent! normal! ggdd