In a large soup pot, add olive oil, carrots, celery, onion, and garlic. Saute until onion is transparent. Add chicken stock, chicken breasts, and salt, and bring to a boil. When chicken is thoroughly cooked, turn burner down and remove chicken pieces and shred. Add lemon juice, and a big splash of soy sauce to pot. Bring the broth back to a boil, and add noodles. When noodles are cooked, turn burner off, and add the shredded chicken; stir to distribute.