average results

src/de/uni_passau/fim/seibt/gitwrapper/process/ToolWrapper.java

 package de.uni_passau.fim.seibt.gitwrapper.process;
 
 import java.io.File;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Optional;
 
@@ -21,7 +22,9 @@ public abstract class ToolWrapper {
     protected abstract boolean isWorking();
 
     protected Optional<ExecRes> exec(File workingDir, boolean redirectError, List<String> parameters) {
-        parameters.listIterator().add(cmd);
-        return ProcessExecutor.exec(workingDir, redirectError, parameters);
+        LinkedList<String> pars = new LinkedList<>(parameters);
+        pars.addFirst(cmd);
+
+        return ProcessExecutor.exec(workingDir, redirectError, pars);
     }
 }