Remove all white space in a file and replace them with a comma using Vim

Anyone has an idea how to remove all white space and replace them with a comma , in a file using Vim ? File input example (words could be everywhere !):

C1       TEST   PROD
A1    BE


T1     B1 

File output example(all words belonging to the same line are like in the example below):

C1,TEST,PROD
A1,BE
T1,B1 

I Found it : %s/\s\{1,}/,/gc