In C please

A Grocery store hires you to write the following functions - Estimate tax - Function name: est_tax, input: base_price, output: value of estimated tax - Note: Tax is 7% - Total price - Function name: total_price, input: base_price, output: final price of a product (included tax) - This function must call est_tax function above - Print thank you - Function name: thank_you, input: None, output: None - This function only printed the following message on the screen - Thank you, We would like to hear your feedback. Please call the following number 1234567890