string.h functions - see Etter pages 315-316
--------------------------------------------
	
	#define SIZE 1024 // some max size for the char arrays
	
	char s[SIZE], *t, *p;  int n, c;
	
p = strcpy( s, t);

	p = strcpy( s, "abc"); // p == s
	
n = strlen( s);

	n = strlen(s); // n == 3
	
p = strcat( s, t);

	p = strcat( s, "defg"); // p == s, s -> "abcdefg" // see chapter6_6.c
	
		strcpy( s, s1); strcat( s, s2); strcat( s, s3);
		//
		// same as:
		//
		strcat( strcat( strcpy( s, s1), s2), s3);
	
p = strstr( s, t);

	p = strstr( s, "de"); // p == s + 3, *p == 'd' // see chapter6_7.c, DNA
	
p = strncpy( s, t, n);

	p = strncpy( s+3, "xyz", 3); // p == s+3, s -> "abcxyzg"
	
	vs.
	
	    strcpy( s+3, "xyz"); // s -> "abcxyz"
	
p = strncat( s, t, n);

	strcpy( s, "abcdefg");
	
	p = strncat( s, "WXYZ", 2); // p == s,  s -> "abcdefgWX"
	
p = strchr( s, c);

	p = strchr( s, 'd'); // p == s + 3

	p = strchr( s, 'Z'); // p == 0

p = strrchr( s, c);

	strcpy( s, "ABCabcABC");

	p = strrchr( s, 'A'); // p == s + 6

p = strpbrk( s, t);

	p = strpbrk( s, "cC"); // p == s + 2

n = strspn( s, t);

	strcpy( s, "  \t\t  abc");

	n = strspn( s, " \t"); // n = 6

	fputs( s+6, stdout); // prints "abc"

n = strcspn( s, t);

	n = strcspn( s, "cb"); // n == 7

c = strcmp( s, t);

	c = strcmp( "abc", "xyz"); // c < 0

	c = strcmp( "xyz", "abc"); // c > 0

	c = strcmp( s, s); // c == 0

c = strncmp( s, t, n);

	c = strncmp( "abcdefg", "abc", 3); // c == 0