add resolve service prototype.

internal/gentools/slices.go

@@ -0,0 +1,24 @@
+package gentools
+
+func IndexOf[T comparable](arr []T, value T) int {
+	for i, v := range arr {
+		if v == value {
+			return i
+		}
+	}
+
+	return -1
+}
+
+func AddUniques[T comparable](arr *[]T, values ...T) {
+Outer:
+	for _, v := range values {
+		for _, v2 := range *arr {
+			if v2 == v {
+				continue Outer
+			}
+		}
+
+		*arr = append(*arr, v)
+	}
+}