function returning days of the week

I need to write a function that would read in a byte that would return
a number between 1 to 7, 1 being Sunday, 2 being Monday, etc. I want
to return an actual string that says "Sunday", or "Monday", etc.
corresponding to the number. I know that the best method to implement
a lookup conversion table would be using switch(variable ) ... case
x: .... structure. However, I may need to pass an array as one of the
parameters in order to access the text itself. Is there anything
inefficient in passing a character array as a parameter based on
memory consumption on an embedded microprocessor system? Thanks.
.

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