0x04. C - More functions, more nested loops
Write a function that checks for uppercase character.
Write a function that checks for a digit (0 through 9).
Write a function that multiplies two integers.
Prototype: int mul(int a, int b);
Write a function that prints the numbers, from 0 to 9, followed by a new line.
Write a function that prints the numbers, from 0 to 9, followed by a new line.
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