initial creation of lexer

Exercise 2/C/TestLexer.c

@@ -1,8 +1,27 @@
 #include <stdio.h>
 #include "Lexer.h"
 
+int start(char* sourcecode) {
+    if (sourcecode != NULL) {
+        return _GET_NEXT_CHARACTER_;
+    } else {
+        return _STOP_;
+    }
+}
+
 int main() {
     char* sourcecode = "Hello World the second - I coded this before. So yeah, FOXES ARE SUPERIOR.\nBut the professor wants us to write the following: \"index = 2 * count + 42;\"";
     printf(sourcecode);
+
+    int lexer_state = _START_;
+    do {
+        switch (lexer_state) {
+            case _START_:
+                lexer_state = start(sourcecode);
+                break;
+            default: lexer_state = _ERROR_;
+        }
+    } while (lexer_state != _STOP_);
+
     return 0;
 }