Writing a function to perform a non-parametric test

I want to write a function that includes a test that will perform either the wilcoxon rank sum test if the length of the unique number of levels is less than three or else perform the kruskal-wallis test. A function that would look like the below that I can apply to any variable:

Non.partest<-function(x, f, round=3){


Any help would be appreciated

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