message: Update shortest-way-to-form-string.cpp
diff: @@ -12,6 +12,7 @@ public:
  find_char_next_pos[source[i] - 'a'] = i + 1;
  lookup[i] = find_char_next_pos;
  }
  +
  int result = 1, start = 0;
  for (const auto& c : target) {
  start = lookup[start][c - 'a'];
  