MS Excel formula to replace space

I am looking for an excel formula for following (Excel 2016 - If that ever matters)
    Prefix "Doc" to  cell A2 value
     Replace space in column A value by _   ( But if there are two or more space have only one _ )
     Write the value to cell B2

E.x  My Single space  should become My_Single_Space
       My  DoubleSpace    turns to  My_DoubleSpace       ( Even though there are two spaces, only one _)
       My   TripleSpace singlespace      turns to My_TripleSpace_SingleSpace
Sam OZAsked:
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Saqib Husain, SyedEngineerCommented:

Change A1 to wherever your data is

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NorieAnalyst Assistant Commented:

="Doc"&SUBSTITUTE(TRIM(A2)," ","_")
Subodh Tiwari (Neeraj)Excel & VBA ExpertCommented:
Maybe this...
Assuming your string is in A2, then try this...
="Doc_"&SUBSTITUTE(SUBSTITUTE(TRIM(A2),CHAR(160),"")," ","_")

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Sam OZAuthor Commented:
The real challenge with me is that whether it is one or two or three space, I should get only one _   . I don't think any of the solution is doin it
Saqib Husain, SyedEngineerCommented:
All of them do it. Send an example file showing your problem.
NorieAnalyst Assistant Commented:
The TRIM function, that all the suggested formulas use, will change multiple spaces within a string to single spaces.

If that's not happening something else must be going on, perhaps the 'spaces' aren't some other non-printing character.
Sam OZAuthor Commented:
My aplogies! that is right
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