Question: This program is in the C language. Single digit: Write the code of a recursive function sumToSingleDigit to sum the digits of a number n

This program is in the C language.

Single digit: Write the code of a recursive function sumToSingleDigit to sum the digits of a number n until you are left with a single digit number. Write a test code which takes the value of n as input and outputs the single digit sum. Example Input: 2507 Example Output: 5

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