fix: changed character encoding for gradle compile to UTF-8

.idea/gradle.xml

@@ -8,6 +8,7 @@
         <option name="testRunner" value="GRADLE" />
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleHome" value="$PROJECT_DIR$/../../../../../../../utils/gradle-7.0" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />

build.gradle

@@ -24,3 +24,7 @@ dependencies {
     testImplementation "org.assertj:assertj-core:3.19.0"
     testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.8.0-M1"
 }
+
+tasks.withType(JavaCompile) {
+    options.encoding = "UTF-8"
+}