# Utility functions for the Hey App
def format_greeting(name):
    """Format a greeting message."""
    return f"Hello, {name}! Welcome to the app."

def calculate_response_time():
    """Simulate a response time calculation."""
    import time
    start_time = time.time()
    # Simulate some processing
    time.sleep(0.5)
    return time.time() - start_time

def validate_input(text):
    """Validate user input."""
    if not text or not text.strip():
        return False, "Input cannot be empty"
    if len(text) > 100:
        return False, "Input too long (max 100 characters)"
    return True, "Valid input"