Optimize Name::cutFirst and Name::cutLast

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/names/Name.kt

@@ -120,12 +120,12 @@ public operator fun Name.get(i: Int): NameToken = tokens[i]
 /**
  * The reminder of the name after last element is cut. For empty name return itself.
  */
-public fun Name.cutLast(): Name = Name(tokens.dropLast(1))
+public fun Name.cutLast(): Name = Name(tokens.subList(0, tokens.size - 1))
 
 /**
  * The reminder of the name after first element is cut. For empty name return itself.
  */
-public fun Name.cutFirst(): Name = Name(tokens.drop(1))
+public fun Name.cutFirst(): Name = Name(tokens.subList(1, tokens.size))
 
 public val Name.length: Int get() = tokens.size
 

dataforge-meta/src/commonTest/kotlin/space/kscience/dataforge/names/NameTest.kt

@@ -38,4 +38,16 @@ class NameTest {
         assertEquals(1, unescapedName.length)
         assertEquals(escapedName, Name.parse(escapedName.toString()))
     }
+
+    @Test
+    fun cutFirst() {
+        val name = Name.parse("a.b.c")
+        assertEquals("b.c".parseAsName(), name.cutFirst())
+    }
+
+    @Test
+    fun cutLast() {
+        val name = Name.parse("a.b.c")
+        assertEquals("a.b".parseAsName(), name.cutLast())
+    }
 }