diff --git a/Exercise 3/Lexer.c b/Exercise 3/Lexer.c
index 12993d4..eb341d1 100644
--- a/Exercise 3/Lexer.c	
+++ b/Exercise 3/Lexer.c	
@@ -1,10 +1,12 @@
 #include "Lexer.h"
 
 int start(char* src) {
-    if (src != 0 && src != '\0') {      // checking if the string is empty or invalid
-        return _GET_NEXT_CHARACTER_;
+    if (src != 0) {                         // checking if the string is invalid
+        if (*src != '\0') {                 // checking if the string is empty
+            return _GET_NEXT_CHARACTER_;    // if src is valid: continueing the state machine
+        }
     }
-    return _STOP_;
+    return _STOP_;                          // stopping the state machine in any other case
 }
 
 int getNextCharacter(char* src) {