TD2 II.3 add for in threadcreate

We've got problem since thread stack are the same

code/test/threadcreate.c

@@ -2,8 +2,13 @@
 #include "syscall.h"
 
 void f(int c) {
+    /* Since our stack is shared with other threads, we've got
+     * a problem here, when executing a thread there is not 8 iterations.
+     * This is like synchronisation */
+    volatile int i;
+    for (i=0;i<8;i++){
         PutChar((char)c);
-    //GetChar();
+    }
     ThreadExit();
 }
 
@@ -12,7 +17,7 @@ int main(){
     for (i=64; i < 68; i++){
         ThreadCreate(f, i);
     }
-    PutString("end of main()\n");
+    // PutString("end of main()\n");
     ThreadExit();
     //return 0;
 }