lowercase.c

/*
	Convert C string to lowercase

	@author parzibyte
*/
#include <stdio.h>
#include <ctype.h>

int main(int argc, char const *argv[])
{
	char my_string[] = "Hello world! this is a simple string. parzibyte.me";
	printf("Original string: %s\n", my_string);

	// Convert each char
	// using tolower
	for (int index = 0; my_string[index] != '\0'; ++index){
		my_string[index] = tolower(my_string[index]);
	}
	printf("After convert: %s\n", my_string);
	return 0;
}