Renaming multiple columns in Julia DataFrames

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Generalizing for an arbitrary number of columns using the built-in rename function from DataFrames.jl:

julia> rename!(data_test, ["X$i" => tech for (i, tech) in enumerate(technology)])
2×3 DataFrame
 Row │ Time   oil    gas
     │ Int64  Int64  Int64
─────┼─────────────────────
   1 │     1      0     10
   2 │     2      1      5
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