Help me understand this SIMPLE Ruby code, using puts in a def

Hi,

I was practicing ruby and accidentally came across something that got me
thinking (nothing important but I want to know why).

Why does the example-1 works and not example-2, if all I'm doing is
moving the puts?

Example-1:
def message
"this is working"
end
puts message.upcase


Example-2:
def message
puts "this is working"
end
message.upcase

Can someone explain this a little bit? I could just ignore it but I
would like to know the reason.

Thanks

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