refactor: split out more code into separate files

internal/util/rand_name.go

@@ -0,0 +1,15 @@
+package util
+
+import "math/rand"
+
+var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+// RandName Generates a random, 32-character, Docker-compatible container name.
+func RandName() string {
+	b := make([]rune, 32)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+
+	return string(b)
+}