Break utils package into subpackages.

internal/utils/strslice/strslice.go

@@ -0,0 +1,12 @@
+package strslice
+
+// Contains checks if slice of strings contains a string
+func Contains(strings []string, contains string) bool {
+	for _, str := range strings {
+		if str == contains {
+			return true
+		}
+	}
+
+	return false
+}