add show course and map names

internal/common/xslices/map.go

@@ -0,0 +1,10 @@
+package xslices
+
+func Map[T, U any](in []T, f func(T) U) []U {
+	out := make([]U, len(in))
+	for i, value := range in {
+		out[i] = f(value)
+	}
+
+	return out
+}