Brachylog, 15 bytes

:2%:"\/"rm:?jbw

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###Explanation

:2%                Input mod 2…
   :"\/"rm         …is the index of the element in string "\/",…
          :?j      …element that we juxtapose Input times to itself…
             bw    …and print to STDOUT after removing one slash/backslash

Brachylog, 15 bytes

:2%:"\/"rm:?jbw

Try it online!

Explanation

:2%                Input mod 2…
   :"\/"rm         …is the index of the element in string "\/",…
          :?j      …element that we juxtapose Input times to itself…
             bw    …and print to STDOUT after removing one slash/backslash