Optimizes memory use of the visual user and url tagger in new posts.

app/src/main/java/com/vitorpamplona/amethyst/model/Note.kt

@@ -615,7 +615,7 @@ open class Note(val idHex: String) {
 
         // Regular Zap Receipts
         zaps.forEach {
-            val noteEvent = it?.value?.event
+            val noteEvent = it.value?.event
             if (noteEvent is LnZapEvent) {
                 sumOfAmounts += noteEvent.amount ?: BigDecimal.ZERO
             }

app/src/main/java/com/vitorpamplona/amethyst/ui/actions/UrlUserTagTransformation.kt

@@ -56,11 +56,9 @@ fun buildAnnotatedStringWithUrlHighlighting(
             val builderAfter = StringBuilder() // important to correctly measure Tag start and end
             append(
                 text
-                    .split('\n')
-                    .map { paragraph: String ->
+                    .split('\n').joinToString("\n") { paragraph: String ->
                         paragraph
-                            .split(' ')
-                            .map { word: String ->
+                            .split(' ').joinToString(" ") { word: String ->
                                 try {
                                     if (word.startsWith("@npub") && word.length >= 64) {
                                         val keyB32 = word.substring(0, 64)
@@ -121,9 +119,7 @@ fun buildAnnotatedStringWithUrlHighlighting(
                                     word
                                 }
                             }
-                            .joinToString(" ")
-                    }
-                    .joinToString("\n"),
+                    },
             )
 
             substitutions.forEach {
@@ -143,9 +139,7 @@ fun buildAnnotatedStringWithUrlHighlighting(
         object : OffsetMapping {
             override fun originalToTransformed(offset: Int): Int {
                 val inInsideRange =
-                    substitutions
-                        .filter { offset > it.original.start && offset < it.original.end }
-                        .firstOrNull()
+                    substitutions.firstOrNull { offset > it.original.start && offset < it.original.end }
 
                 if (inInsideRange != null) {
                     val percentInRange =
@@ -165,9 +159,7 @@ fun buildAnnotatedStringWithUrlHighlighting(
 
             override fun transformedToOriginal(offset: Int): Int {
                 val inInsideRange =
-                    substitutions
-                        .filter { offset > it.modified.start && offset < it.modified.end }
-                        .firstOrNull()
+                    substitutions.firstOrNull { offset > it.modified.start && offset < it.modified.end }
 
                 if (inInsideRange != null) {
                     val percentInRange =