@avinashaecwb,
I would use something like that. Basically, you need to know the length of Base64 encoded string. So in your case, you can use $base64x28., instead of $base64x32767. 32767 is the max length of string when using Base64.
%let name ='4KSm4KWA4KSqIOCkmuCkguCkpg==';
%let name_decode = (%trim(%sysfunc(inputc(%scan(&name,1,':')===,$base64x32767.))));
%put &=name_decode;
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