from typing import Dict


def target(seed: str, substitutions: Dict[str, str]) -> str:
    """Compute target string applying substitutions.

    Args:
        seed (str): seed string.
        substitutions (Dict[str, str]): substitutions to apply.

    Returns:
        target string.
    """
    target = seed

    for old, new in substitutions.items():
        target = target.replace(old, new)

    return target