Remove last character from dictionary<string, dictionary<string, string>> using C#

I have 

Dictionary<string, Dictionary<string, string>>

My inner dictionary has the following data

{
  "1": {
    "message-Code1": "   0",
    "msg-Number-Pos11": "0",
    "msg-Number-Pos21": "0",
    "msg-Number-Pos31": " "
  },
  "2": {
    "message-Code2": "   0",
    "msg-Number-Pos12": "0",
    "msg-Number-Pos22": "0",
    "msg-Number-Pos32": " "
  }

But I want a out like below

{
  "1": {
    "message-Code": "   0",
    "msg-Number-Pos1": "0",
    "msg-Number-Pos2": "0",
    "msg-Number-Pos3": " "
  },
  "2": {
    "message-Code": "   0",
    "msg-Number-Pos1": "0",
    "msg-Number-Pos2": "0",
    "msg-Number-Pos3": " "
  }

Last character of the all the Key's is removed i.e 1 in the first set and 2 in the second set of result.

I was trying with below code

var result = dictionary.Where(pair => pair.Value.Remove(pair.Value.Key.Last()));

This is throwing an error. Can anyone help me in bringing the output that I need.

Jon Skeet
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Basically you should create new "inner" dictionaries. That's easy to do though:

var replacedOuter = outerDictionary.ToDictionary(
   outerKey => outerKey, // Outer key stays the same
   outerValue => outerValue.ToDictionary(
       innerKey => innerKey.Substring(0, innerKey.Length - 1),
       innerValue => innerValue));

Note that if this creates any duplicate keys (i.e. if there were any keys that only differed by final character) an exception will be thrown by the inner ToDictionary call.

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