Add scalafmtOnCompile to build.sbt

Author: sentenza

build.sbt

@@ -4,6 +4,8 @@ val LogbackVersion    = "1.2.6"
 val ScalaTestVersion  = "3.2.10"
 val FlexmarkVersion   = "0.62.2"
 
+scalafmtOnCompile := true
+
 lazy val root = (project in file("."))
   .settings(
     organization := "com.github.thealgorithms",