Removing spaces for all the columns of a CSV file

Question

I have a CSV file in which every column contains unnecessary extra spaces added to it before the actual value. I want to create a new CSV file by removing all the spaces.

For example

One line in input CSV file

 123, ste hen, 456, out put

Expected output CSV file

123,ste hen,456,out put

I tried using awk to trim each column but it didn't work.

Answer 1

echo " 123, ste hen, 456, out put" | awk '{sub(/^ +/,""); gsub(/, /,",")}1'
123,ste hen,456,out put