Convert list in Scala to a formatted string

Have a look at mkString. In short:

Displays all elements of this list in a string using a separator
string (In your case “/”)

scala> List(1,2,3).mkString("/")
res0: String = 1/2/3

scala> List(1,2,3).mkString
res1: String = 123

// def mkString(start: String,sep: String,end: String): String 
scala> List(1,2,3).mkString("@", "/", "@")
res2: String = @1/2/3@