string of numbers

write a function that accepts string of numbers and converts it to digits 
as example convert("123")=123

	#include <stdio.h>
	void convert(char *base)// passing array to a function
	{
	while(*base!='\0')
	{
	*base-='0';//*base=*base-'0' will give you the numeric value of character number
	printf("%d",*base);
	base++;
	}
	}
	int main()
	{
	char num_char[5]="83461";
	convert(num_char);
	return 0;
	}

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