Concatenate two strings with a comma.
If s1 has no length then s2 is returned as-is. If s2 has no length then s1 is returned as-is. Otherwise the strings are concatenated with a comma delimiter.
s1
s2
Optional
the string to append to
the string to append
the comma-concatenated string
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Concatenate two strings with a comma.
If
s1has no length thens2is returned as-is. Ifs2has no length thens1is returned as-is. Otherwise the strings are concatenated with a comma delimiter.