Move 'genRange' function to 'cmd'

cmd/helpers.go

@@ -2,6 +2,10 @@ package main
 
 import "slices"
 
+type character interface {
+	int | rune
+}
+
 // Returns all elements in slice A that are NOT in slice B
 func setDifference[T comparable](s1 []T, s2 []T) []T {
 	toReturn := make([]T, 0, len(s1))
@@ -12,3 +16,12 @@ func setDifference[T comparable](s1 []T, s2 []T) []T {
 	}
 	return toReturn
 }
+
+// Generate numbers in a range - start (inclusive) to end (exclusive)
+func genRange[T character](start, end T) []T {
+	toRet := make([]T, end-start)
+	for i := start; i < end; i++ {
+		toRet[i-start] = i
+	}
+	return toRet
+}