diff --git a/Kotlin_extensions/src/main/java/com/eldhopj/kotlin_extensions/utils/formatter/Formatter.kt b/Kotlin_extensions/src/main/java/com/eldhopj/kotlin_extensions/utils/formatter/Formatter.kt
index affc364..de98ca6 100644
--- a/Kotlin_extensions/src/main/java/com/eldhopj/kotlin_extensions/utils/formatter/Formatter.kt
+++ b/Kotlin_extensions/src/main/java/com/eldhopj/kotlin_extensions/utils/formatter/Formatter.kt
@@ -1,6 +1,7 @@
 package com.eldhopj.kotlin_extensions.utils.formatter
 
 import java.util.Date
+import org.jetbrains.annotations.NotNull
 
 internal interface Formatter {
 
@@ -10,7 +11,7 @@ internal interface Formatter {
      * @param date {@link Date} object
      * @param pattern Pattern to format(e.g, yyyy-MM-dd)
      */
-    fun format(date: Date, pattern: String): String
+    fun format(@NotNull date: Date?, @NotNull pattern: String): String
 
     /**
      * Formats the given date object to the specified pattern
@@ -18,7 +19,7 @@ internal interface Formatter {
      * @param date string date value
      * @param pattern Pattern to which the date follows(e.g, yyyy-MM-dd)
      */
-    fun format(date: String, pattern: String): Date?
+    fun format(@NotNull date: String, @NotNull pattern: String): Date?
 
     /**
      * Formats the given date object to the specified pattern
@@ -27,6 +28,10 @@ internal interface Formatter {
      * @param fromPattern Pattern to which the date follows(e.g, yyyy-MM-dd)
      * @param toPattern Pattern to format(e.g, yyyy-MM-dd)
      */
-    fun format(date: String, fromPattern: String, toPattern: String): String
+    fun format(
+        @NotNull date: String,
+        @NotNull fromPattern: String,
+        @NotNull toPattern: String
+    ): String
 
 }
diff --git a/app/build.gradle b/app/build.gradle
index cd18b1d..befc126 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -39,7 +39,6 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
 
     implementation project(':Kotlin_extensions')
 }
diff --git a/jitpack.yml b/jitpack.yml
index adb3fe1..faa03d2 100644
--- a/jitpack.yml
+++ b/jitpack.yml
@@ -1,2 +1,4 @@
 jdk:
   - openjdk11
+before_install:
+  - ./scripts/prepareJitpackEnvironment.sh