Normalize Ingredient Names to Title Case

PandasHardSenior level~10 min

Problem

A recipe app imports ingredient lines from many messy sources into the `ingredient_lines` DataFrame, so the casing is inconsistent. Rewrite the `raw_line` column into title case: the first letter of every word becomes uppercase and every other letter becomes lowercase. Words are separated by single spaces, and all existing spaces must be preserved exactly. Return `entry_id`, `raw_line` (unchanged), and the cleaned value as a new column `tidy_line`.

Input data

Example rows — the live problem includes the full dataset.

ingredient_lines

entry_id	raw_line
1	two cups of FLOUR
2	one TEASPOON sea salt
3	fresh basil AND ripe tomato
4	EXTRA virgin olive OIL

Expected output

Your answer should return 4 rows with the columns entry_id, raw_line, tidy_line.

Starter code (Pandas (Python))

import pandas as pd

def normalize_ingredient_names(ingredient_lines) -> pd.DataFrame:
    # Your code here
    return ingredient_lines

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