diff --git a/src/main/kotlin/net/thauvin/erik/mobibot/Mobibot.kt b/src/main/kotlin/net/thauvin/erik/mobibot/Mobibot.kt
index d8ff578..cdc7a8f 100644
--- a/src/main/kotlin/net/thauvin/erik/mobibot/Mobibot.kt
+++ b/src/main/kotlin/net/thauvin/erik/mobibot/Mobibot.kt
@@ -35,6 +35,8 @@ package net.thauvin.erik.mobibot
 import net.thauvin.erik.mobibot.Utils.appendIfMissing
 import net.thauvin.erik.mobibot.Utils.bot
 import net.thauvin.erik.mobibot.Utils.getIntProperty
+import net.thauvin.erik.mobibot.Utils.helpCmdSyntax
+import net.thauvin.erik.mobibot.Utils.helpFormat
 import net.thauvin.erik.mobibot.Utils.isChannelOp
 import net.thauvin.erik.mobibot.Utils.lastOrEmpty
 import net.thauvin.erik.mobibot.Utils.sendList
@@ -134,13 +136,9 @@ class Mobibot(nickname: String, val channel: String, logsDirPath: String, p: Pro
         event.sendMessage("Type a URL on $channel to post it.")
         event.sendMessage("For more information on a specific command, type:")
         event.sendMessage(
-            Utils.helpFormat(
-                Utils.buildCmdSyntax(
-                    "%c ${Constants.HELP_CMD} <command>",
-                    event.bot().nick,
-                    event is PrivateMessageEvent
-                )
-            ),
+            helpFormat(
+                helpCmdSyntax("%c ${Constants.HELP_CMD} <command>", event.bot().nick, event is PrivateMessageEvent)
+            )
         )
         event.sendMessage("The commands are:")
         event.sendList(addons.names.commands, 8, isBold = true, isIndent = true)
diff --git a/src/main/kotlin/net/thauvin/erik/mobibot/Utils.kt b/src/main/kotlin/net/thauvin/erik/mobibot/Utils.kt
index 20286c1..6becd6e 100644
--- a/src/main/kotlin/net/thauvin/erik/mobibot/Utils.kt
+++ b/src/main/kotlin/net/thauvin/erik/mobibot/Utils.kt
@@ -161,6 +161,16 @@ object Utils {
     @JvmStatic
     fun String?.green(): String = colorize(Colors.DARK_GREEN)
 
+    /**
+     * Build a help command by replacing `%c` with the bot's pub/priv command, and `%n` with the bot's
+     * nick.
+     */
+    @JvmStatic
+    fun helpCmdSyntax(text: String, botNick: String, isPrivate: Boolean): String {
+        val replace = arrayOf(if (isPrivate) "/msg $botNick" else "$botNick:", botNick)
+        return text.replaceEach(searchFlags, replace)
+    }
+
     /**
      * Returns a formatted help string.
      */
diff --git a/src/main/kotlin/net/thauvin/erik/mobibot/commands/AbstractCommand.kt b/src/main/kotlin/net/thauvin/erik/mobibot/commands/AbstractCommand.kt
index 674fe0f..f773cdd 100644
--- a/src/main/kotlin/net/thauvin/erik/mobibot/commands/AbstractCommand.kt
+++ b/src/main/kotlin/net/thauvin/erik/mobibot/commands/AbstractCommand.kt
@@ -33,12 +33,11 @@
 package net.thauvin.erik.mobibot.commands
 
 import net.thauvin.erik.mobibot.Utils.bot
-import net.thauvin.erik.mobibot.Utils.buildCmdSyntax
+import net.thauvin.erik.mobibot.Utils.helpCmdSyntax
 import net.thauvin.erik.mobibot.Utils.isChannelOp
 import net.thauvin.erik.mobibot.Utils.sendMessage
 import org.pircbotx.hooks.events.PrivateMessageEvent
 import org.pircbotx.hooks.types.GenericMessageEvent
-import java.util.concurrent.ConcurrentHashMap
 
 abstract class AbstractCommand {
     abstract val name: String
@@ -47,16 +46,14 @@ abstract class AbstractCommand {
     abstract val isPublic: Boolean
     abstract val isVisible: Boolean
 
-    val properties: MutableMap<String, String> = ConcurrentHashMap()
+    val properties: MutableMap<String, String> = mutableMapOf()
 
     abstract fun commandResponse(channel: String, args: String, event: GenericMessageEvent)
 
     open fun helpResponse(channel: String, topic: String, event: GenericMessageEvent): Boolean {
         if (!isOpOnly || isOpOnly == isChannelOp(channel, event)) {
             for (h in help) {
-                event.sendMessage(
-                    buildCmdSyntax(h, event.bot().nick, event is PrivateMessageEvent || !isPublic),
-                )
+                event.sendMessage(helpCmdSyntax(h, event.bot().nick, event is PrivateMessageEvent || !isPublic))
             }
             return true
         }
diff --git a/src/main/kotlin/net/thauvin/erik/mobibot/commands/Ignore.kt b/src/main/kotlin/net/thauvin/erik/mobibot/commands/Ignore.kt
index afd9bf4..df56e34 100644
--- a/src/main/kotlin/net/thauvin/erik/mobibot/commands/Ignore.kt
+++ b/src/main/kotlin/net/thauvin/erik/mobibot/commands/Ignore.kt
@@ -34,7 +34,7 @@ package net.thauvin.erik.mobibot.commands
 
 import net.thauvin.erik.mobibot.Utils.bold
 import net.thauvin.erik.mobibot.Utils.bot
-import net.thauvin.erik.mobibot.Utils.buildCmdSyntax
+import net.thauvin.erik.mobibot.Utils.helpCmdSyntax
 import net.thauvin.erik.mobibot.Utils.helpFormat
 import net.thauvin.erik.mobibot.Utils.isChannelOp
 import net.thauvin.erik.mobibot.Utils.sendList
@@ -90,7 +90,7 @@ class Ignore : AbstractCommand() {
     override fun helpResponse(channel: String, topic: String, event: GenericMessageEvent): Boolean {
         return if (isChannelOp(channel, event)) {
             for (h in helpOp) {
-                event.sendMessage(buildCmdSyntax(h, event.bot().nick, true))
+                event.sendMessage(helpCmdSyntax(h, event.bot().nick, true))
             }
             true
         } else {
diff --git a/src/main/kotlin/net/thauvin/erik/mobibot/commands/links/View.kt b/src/main/kotlin/net/thauvin/erik/mobibot/commands/links/View.kt
index f853cae..dd22c0e 100644
--- a/src/main/kotlin/net/thauvin/erik/mobibot/commands/links/View.kt
+++ b/src/main/kotlin/net/thauvin/erik/mobibot/commands/links/View.kt
@@ -33,7 +33,7 @@
 package net.thauvin.erik.mobibot.commands.links
 
 import net.thauvin.erik.mobibot.Utils.bot
-import net.thauvin.erik.mobibot.Utils.buildCmdSyntax
+import net.thauvin.erik.mobibot.Utils.helpCmdSyntax
 import net.thauvin.erik.mobibot.Utils.helpFormat
 import net.thauvin.erik.mobibot.Utils.lastOrEmpty
 import net.thauvin.erik.mobibot.Utils.sendMessage
@@ -109,11 +109,7 @@ class View : AbstractCommand() {
                 event.sendMessage("To view more, try: ")
                 event.sendMessage(
                     helpFormat(
-                        buildCmdSyntax(
-                            "%c $name ${index + 1} $query",
-                            event.bot().nick,
-                            event is PrivateMessageEvent
-                        )
+                        helpCmdSyntax("%c $name ${index + 1} $query", event.bot().nick, event is PrivateMessageEvent)
                     )
                 )
             }
diff --git a/src/main/kotlin/net/thauvin/erik/mobibot/commands/tell/Tell.kt b/src/main/kotlin/net/thauvin/erik/mobibot/commands/tell/Tell.kt
index 1100c99..a581cd5 100644
--- a/src/main/kotlin/net/thauvin/erik/mobibot/commands/tell/Tell.kt
+++ b/src/main/kotlin/net/thauvin/erik/mobibot/commands/tell/Tell.kt
@@ -33,7 +33,7 @@ package net.thauvin.erik.mobibot.commands.tell
 
 import net.thauvin.erik.mobibot.Utils.bold
 import net.thauvin.erik.mobibot.Utils.bot
-import net.thauvin.erik.mobibot.Utils.buildCmdSyntax
+import net.thauvin.erik.mobibot.Utils.helpCmdSyntax
 import net.thauvin.erik.mobibot.Utils.helpFormat
 import net.thauvin.erik.mobibot.Utils.isChannelOp
 import net.thauvin.erik.mobibot.Utils.plural
@@ -256,11 +256,7 @@ class Tell(private val serialObject: String) : AbstractCommand() {
             event.sendMessage("To delete one or all delivered messages:")
             event.sendMessage(
                 helpFormat(
-                    buildCmdSyntax(
-                        "%c $name $TELL_DEL_KEYWORD <id|$TELL_ALL_KEYWORD>",
-                        event.bot().nick,
-                        true
-                    )
+                    helpCmdSyntax("%c $name $TELL_DEL_KEYWORD <id|$TELL_ALL_KEYWORD>", event.bot().nick, true)
                 )
             )
             event.sendMessage(help.last())
diff --git a/src/main/kotlin/net/thauvin/erik/mobibot/modules/AbstractModule.kt b/src/main/kotlin/net/thauvin/erik/mobibot/modules/AbstractModule.kt
index 25e7c9d..83eafcf 100644
--- a/src/main/kotlin/net/thauvin/erik/mobibot/modules/AbstractModule.kt
+++ b/src/main/kotlin/net/thauvin/erik/mobibot/modules/AbstractModule.kt
@@ -32,7 +32,7 @@
 package net.thauvin.erik.mobibot.modules
 
 import net.thauvin.erik.mobibot.Utils.bot
-import net.thauvin.erik.mobibot.Utils.buildCmdSyntax
+import net.thauvin.erik.mobibot.Utils.helpCmdSyntax
 import net.thauvin.erik.mobibot.Utils.sendMessage
 import org.pircbotx.hooks.events.PrivateMessageEvent
 import org.pircbotx.hooks.types.GenericMessageEvent
@@ -79,7 +79,7 @@ abstract class AbstractModule {
      */
     open fun helpResponse(event: GenericMessageEvent): Boolean {
         for (h in help) {
-            event.sendMessage(buildCmdSyntax(h, event.bot().nick, isPrivateMsgEnabled && event is PrivateMessageEvent))
+            event.sendMessage(helpCmdSyntax(h, event.bot().nick, isPrivateMsgEnabled && event is PrivateMessageEvent))
         }
         return true
     }
diff --git a/src/main/kotlin/net/thauvin/erik/mobibot/modules/CurrencyConverter.kt b/src/main/kotlin/net/thauvin/erik/mobibot/modules/CurrencyConverter.kt
index f6de896..e597df7 100644
--- a/src/main/kotlin/net/thauvin/erik/mobibot/modules/CurrencyConverter.kt
+++ b/src/main/kotlin/net/thauvin/erik/mobibot/modules/CurrencyConverter.kt
@@ -33,7 +33,7 @@ package net.thauvin.erik.mobibot.modules
 
 import net.thauvin.erik.mobibot.Utils.bold
 import net.thauvin.erik.mobibot.Utils.bot
-import net.thauvin.erik.mobibot.Utils.buildCmdSyntax
+import net.thauvin.erik.mobibot.Utils.helpCmdSyntax
 import net.thauvin.erik.mobibot.Utils.helpFormat
 import net.thauvin.erik.mobibot.Utils.sendList
 import net.thauvin.erik.mobibot.Utils.sendMessage
@@ -111,11 +111,11 @@ class CurrencyConverter : ThreadedModule() {
         } else {
             val nick = event.bot().nick
             event.sendMessage("To convert from one currency to another:")
-            event.sendMessage(helpFormat(buildCmdSyntax("%c $CURRENCY_CMD 100 USD to EUR", nick, isPrivateMsgEnabled)))
+            event.sendMessage(helpFormat(helpCmdSyntax("%c $CURRENCY_CMD 100 USD to EUR", nick, isPrivateMsgEnabled)))
             event.sendMessage("For a listing of current reference rates:")
             event.sendMessage(
                 helpFormat(
-                    buildCmdSyntax("%c $CURRENCY_CMD $CURRENCY_RATES_KEYWORD", nick, isPrivateMsgEnabled)
+                    helpCmdSyntax("%c $CURRENCY_CMD $CURRENCY_RATES_KEYWORD", nick, isPrivateMsgEnabled)
                 )
             )
             event.sendMessage("The supported currencies are: ")
@@ -161,13 +161,14 @@ class CurrencyConverter : ThreadedModule() {
                 } else {
                     val to = cmds[1].uppercase()
                     val from = cmds[3].uppercase()
-                    if (EXCHANGE_RATES.containsKey(to) && EXCHANGE_RATES.containsKey(from)) {
+                    val toRate = EXCHANGE_RATES[to]
+                    val fromRate = EXCHANGE_RATES[from]
+                    if (!toRate.isNullOrBlank() && !fromRate.isNullOrBlank()) {
                         try {
                             val amt = cmds[0].replace(",", "").toDouble()
-                            val doubleFrom = EXCHANGE_RATES[to]!!.toDouble()
-                            val doubleTo = EXCHANGE_RATES[from]!!.toDouble()
                             PublicMessage(
-                                amt.formatCurrency(to) + " = " + (amt * doubleTo / doubleFrom).formatCurrency(from)
+                                amt.formatCurrency(to) + " = "
+                                        + (amt * toRate.toDouble() / fromRate.toDouble()).formatCurrency(from)
                             )
                         } catch (e: NumberFormatException) {
                             ErrorMessage("Let's try with some real numbers next time, okay?")
diff --git a/src/test/kotlin/net/thauvin/erik/mobibot/UtilsTest.kt b/src/test/kotlin/net/thauvin/erik/mobibot/UtilsTest.kt
index 29ae070..2cd92ba 100644
--- a/src/test/kotlin/net/thauvin/erik/mobibot/UtilsTest.kt
+++ b/src/test/kotlin/net/thauvin/erik/mobibot/UtilsTest.kt
@@ -37,7 +37,6 @@ import assertk.assertions.isEqualTo
 import assertk.assertions.length
 import net.thauvin.erik.mobibot.Utils.appendIfMissing
 import net.thauvin.erik.mobibot.Utils.bold
-import net.thauvin.erik.mobibot.Utils.buildCmdSyntax
 import net.thauvin.erik.mobibot.Utils.capitalise
 import net.thauvin.erik.mobibot.Utils.capitalizeWords
 import net.thauvin.erik.mobibot.Utils.colorize
@@ -45,6 +44,7 @@ import net.thauvin.erik.mobibot.Utils.cyan
 import net.thauvin.erik.mobibot.Utils.encodeUrl
 import net.thauvin.erik.mobibot.Utils.getIntProperty
 import net.thauvin.erik.mobibot.Utils.green
+import net.thauvin.erik.mobibot.Utils.helpCmdSyntax
 import net.thauvin.erik.mobibot.Utils.helpFormat
 import net.thauvin.erik.mobibot.Utils.lastOrEmpty
 import net.thauvin.erik.mobibot.Utils.obfuscate
@@ -58,8 +58,6 @@ import net.thauvin.erik.mobibot.Utils.toIsoLocalDate
 import net.thauvin.erik.mobibot.Utils.toUtcDateTime
 import net.thauvin.erik.mobibot.Utils.today
 import net.thauvin.erik.mobibot.Utils.unescapeXml
-import net.thauvin.erik.mobibot.Utils.uptime
-import net.thauvin.erik.mobibot.Utils.urlReader
 import net.thauvin.erik.mobibot.msg.Message.Companion.DEFAULT_COLOR
 import org.pircbotx.Colors
 import org.testng.annotations.BeforeClass
@@ -105,15 +103,6 @@ class UtilsTest {
         assertThat("test".bold(), "test.bold()").isEqualTo(Colors.BOLD + "test" + Colors.BOLD)
     }
 
-    @Test
-    fun testBuildCmdSyntax() {
-        val bot = "mobibot"
-        assertThat(buildCmdSyntax("%c $test %n $test", bot, false), "public")
-            .isEqualTo("$bot: $test $bot $test")
-        assertThat(buildCmdSyntax("%c %n $test %c $test %n", bot, true), "public")
-            .isEqualTo("/msg $bot $bot $test /msg $bot $test $bot")
-    }
-
 
     @Test
     fun testCapitalise() {
@@ -172,6 +161,15 @@ class UtilsTest {
         assertThat(ascii.green()).isEqualTo(Colors.DARK_GREEN + ascii + Colors.NORMAL)
     }
 
+    @Test
+    fun testHelpCmdSyntax() {
+        val bot = "mobibot"
+        assertThat(helpCmdSyntax("%c $test %n $test", bot, false), "public")
+            .isEqualTo("$bot: $test $bot $test")
+        assertThat(helpCmdSyntax("%c %n $test %c $test %n", bot, true), "public")
+            .isEqualTo("/msg $bot $bot $test /msg $bot $test $bot")
+    }
+
     @Test
     fun testHelpFormat() {
         assertThat(helpFormat(test, isBold = true, isIndent = false), "bold")
@@ -260,18 +258,6 @@ class UtilsTest {
         )
     }
 
-    @Test
-    fun testUptime() {
-        assertThat(uptime(547800300076L), "full")
-            .isEqualTo("17 years 2 months 2 weeks 1 day 6 hours 45 minutes")
-        assertThat(uptime(2700000L), "minutes").isEqualTo("45 minutes")
-        assertThat(uptime(24300000L), "hours minutes").isEqualTo("6 hours 45 minutes")
-        assertThat(uptime(110700000L), "days hours minutes").isEqualTo("1 day 6 hours 45 minutes")
-        assertThat(uptime(1320300000L), "weeks days hours minutes")
-            .isEqualTo("2 weeks 1 day 6 hours 45 minutes")
-        assertThat(uptime(0L), "0 minutes").isEqualTo("0 minute")
-    }
-
     @Test
     @Throws(IOException::class)
     fun testUrlReader() {