start and stop a Coroutine in a non MonoBehaviour script

I have a non monoBehaviour script that want to call startCoroutine,
and I successfully did it using the ans here:
http://answers.unity3d.com/questions/161084/coroutine-without-monobehaviour.html

While I also want to stop the coroutine when receive player input, say call StopCoroutine(String) when player press spacebar.

I have tried to change the StartChildCoroutine's parameter as string (so that I can use the StopCoroutine, but startCoroutine failed.)

Can anyone suggest a solution to stop my coroutine?

 public class NPCSpeeching : MonoBehaviour {
      private List<SpeechContext> allSpeech=new List<SpeechContext>();
      void Start () {
         allSpeech[0].doSpeechOperation();
      }

     public void StartChildCoroutine(IEnumerator coroutineMethod)
     {
         StartCoroutine(coroutineMethod);
     }


      public class SpeechContext{
         SpeechStrategy strategy;
 
         public SpeechContext(SpeechStrategy strategy){
             this.strategy=strategy;
         }
 
         public string getSentence (){
             return strategy.getSentence ();
         }
 
         public void doSpeechOperation(){
             strategy.SpeechAlgorithmInterface ();
         }
     }
 }

//The strategy interface

 public abstract class SpeechStrategy {
     
         public abstract void SpeechAlgorithmInterface();
     
         public abstract string getSentence();
     
     
     }

//A strategy

 public class NormalSpeechStrategy : SpeechStrategy {
     
         public MySentence mySentence;
     
         public NormalSpeechStrategy(MySentence mySentence,NPCSpeeching NPCspeeching,SpeechManager speechManager,Image speechUIImage,Text speechUiText):base(NPCspeeching,speechManager,speechUIImage,speechUiText){
     
             this.mySentence = mySentence;
         }
     
 
         public override void SpeechAlgorithmInterface(){
             speechManager.displaySpeechUI ();
             npcSpeeching.StartChildCoroutine (printOneString());       //the function can be print successfully. 
     
         }
     
         private IEnumerator printOneString(){
             string currentWord=null;
             foreach(char character in mySentence.sentence.ToCharArray()){
                 currentWord+=character;
                 speechUiText.text=currentWord;
                 yield return new WaitForSeconds (mySentence.speechSpeed);
             }
             speechManager.startShiftingNextIcon();
         }
     }

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