Remove a few util functions that aren't necessary

src/duplicacy_utils.go

@@ -460,31 +460,3 @@ func AtoSize(sizeString string) int {
 
 	return size
 }
-
-func MinInt(x, y int) int {
-	if x < y {
-		return x
-	}
-	return y
-}
-
-// Contains tells whether a contains x.
-func Contains(a []string, x string) bool {
-	for _, n := range a {
-		if x == n {
-			return true
-		}
-	}
-	return false
-}
-
-// Find returns the smallest index i at which x == a[i],
-// or len(a) if there is no such index.
-func Find(a []string, x string) int {
-	for i, n := range a {
-		if x == n {
-			return i
-		}
-	}
-	return len(a)
-}