diff --git a/src/seedu/addressbook/AddressBook.java b/src/seedu/addressbook/AddressBook.java
index 5a158b67..9b33c6d6 100644
--- a/src/seedu/addressbook/AddressBook.java
+++ b/src/seedu/addressbook/AddressBook.java
@@ -210,6 +210,10 @@ public static void main(String[] args) {
         showWelcomeMessage();
         processProgramArgs(args);
         loadDataFromStorage();
+        runProgram();
+    }
+
+    private static void runProgram() {
         while (true) {
             String userCommand = getUserInput();
             echoUserCommand(userCommand);
@@ -989,12 +993,12 @@ private static String extractPhoneFromPersonString(String encoded) {
 
         // phone is last arg, target is from prefix to end of string
         if (indexOfPhonePrefix > indexOfEmailPrefix) {
-            return removePrefixSign(encoded.substring(indexOfPhonePrefix, encoded.length()).trim(),
+            return removePrefix(encoded.substring(indexOfPhonePrefix, encoded.length()).trim(),
                     PERSON_DATA_PREFIX_PHONE);
 
         // phone is middle arg, target is from own prefix to next prefix
         } else {
-            return removePrefixSign(
+            return removePrefix(
                     encoded.substring(indexOfPhonePrefix, indexOfEmailPrefix).trim(),
                     PERSON_DATA_PREFIX_PHONE);
         }
@@ -1012,12 +1016,12 @@ private static String extractEmailFromPersonString(String encoded) {
 
         // email is last arg, target is from prefix to end of string
         if (indexOfEmailPrefix > indexOfPhonePrefix) {
-            return removePrefixSign(encoded.substring(indexOfEmailPrefix, encoded.length()).trim(),
+            return removePrefix(encoded.substring(indexOfEmailPrefix, encoded.length()).trim(),
                     PERSON_DATA_PREFIX_EMAIL);
 
         // email is middle arg, target is from own prefix to next prefix
         } else {
-            return removePrefixSign(
+            return removePrefix(
                     encoded.substring(indexOfEmailPrefix, indexOfPhonePrefix).trim(),
                     PERSON_DATA_PREFIX_EMAIL);
         }
@@ -1146,12 +1150,12 @@ private static String getUsageInfoForExitCommand() {
     /**
      * Removes sign(p/, d/, etc) from parameter string
      *
-     * @param s  Parameter as a string
-     * @param sign  Parameter sign to be removed
+     * @param fullString  Parameter as a string
+     * @param prefix  Parameter sign to be removed
      * @return  string without the sign
      */
-    private static String removePrefixSign(String s, String sign) {
-        return s.replace(sign, "");
+    private static String removePrefix(String fullString, String prefix) {
+        return fullString.replace(prefix, "");
     }
 
     /**