Fix find_indices to support UTF-8 characters

trans/tests/a_a_errtest.py

 import sys
 import math
 
-def g():
+def gàé():
     return 1,2,3
 
 if __name__ == "__main__":
     if True:
-        a, b, c = g()
\ No newline at end of file
+        a, b = gàé()       # abc
\ No newline at end of file

trans/transpiler/__init__.py

@@ -148,8 +148,8 @@ def find_indices(s, indices: list[int]) -> list[int]:
             except StopIteration:
                 break
 
+        j += len(s[i].encode("utf-8"))
         i += 1
-        j += 1
     assert len(results) == len(indices), (results, indices, s)
     return sorted(list(results))