I think what is confusing you is "Where are the spaces coming from ?"
# If this is an array
@a = ("A","B","C");
# result =A B C ie. all spaced out
# because as the Camel book says
# Array variables are interpolated into double
# quoted strings by joining all the elements
# of the array with the delimiter specified
# in the $" variable (which is space by default)
print join ('',@a);
# result =ABC
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