Problem 01

.gitignore

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+/.bsp/
+target/
+.bloop
+.metals
+.vscode
+/project

build.sbt

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+import Dependencies._
+
+ThisBuild / scalaVersion     := "3.8.2"
+ThisBuild / version          := "0.1.0-SNAPSHOT"
+ThisBuild / organization     := "com.example"
+ThisBuild / organizationName := "example"
+
+lazy val root = (project in file("."))
+  .settings(
+    name := "ninetyNineScalaProblems",
+    libraryDependencies += munit % Test
+  )
+
+// See https://www.scala-sbt.org/1.x/docs/Using-Sonatype.html for instructions on how to publish to Sonatype.
+
+
+libraryDependencies += "org.scalameta" %% "munit" % "1.0.4" % Test

src/main/scala/ninetyNineScalaProblems/Problem01.scala

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+package ninetyNineScalaProblems
+
+object Problem01:
+    def lastElement(list: List[Any]): Option[Any] = 
+        list match
+            case Nil => None
+            case _ => Some(list(list.length - 1))
+
+object Problem01Stdlib:
+    def lastElement(list: List[Any]): Option[Any] =
+        list match
+            case Nil => None
+            case _ => Some(list.last)

src/test/scala/ninetyNineScalaProblems/Problem01Suite.scala

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+package ninetyNineScalaProblems
+
+class Problem01Suite extends munit.FunSuite:
+    List(
+        (List(1, 2, 3, 4, 5), Some(5)),
+        (List(1), Some(1)),
+        (List(), None)
+    ).foreach:
+            case (list, expected) =>
+                test(s"lastElement returns [$expected]"):
+                    assertEquals(Problem01.lastElement(list), expected, "Problem01")
+                    assertEquals(Problem01Stdlib.lastElement(list), expected, "Problem01Stdlib")