program works now, added a little documentation

util.go

@@ -0,0 +1,48 @@
+package main
+
+import "log"
+
+func Exists[K comparable, V any](m map[K]V, v K) bool {
+	if _, ok := m[v]; ok {
+		return true
+	}
+	return false
+}
+
+func Die(err error) int {
+	log.Fatal("Error: ", err.Error())
+
+	return 1
+}
+
+// find an item in a list, generic variant
+func Contains[E comparable](s []E, v E) bool {
+	for _, vs := range s {
+		if v == vs {
+			return true
+		}
+	}
+
+	return false
+}
+
+// Transpose a matrix, x=>y, y=>x
+// via https://gist.github.com/tanaikech/5cb41424ff8be0fdf19e78d375b6adb8
+func Transpose(slice [][]string) [][]string {
+	xl := len(slice[0])
+	yl := len(slice)
+
+	result := make([][]string, xl)
+
+	for i := range result {
+		result[i] = make([]string, yl)
+	}
+
+	for i := 0; i < xl; i++ {
+		for j := 0; j < yl; j++ {
+			result[i][j] = slice[j][i]
+		}
+	}
+
+	return result
+}