1.  (5+5)  Write a function called strcpy that takes in two strings and copies
the contents of the first string to the second string.  Write another function
called strcat, which concatenates string s1 to string s2, placing the full
string in dst.  
void strcpy(char src[], char dst[]);
void strcat(char dst[], char s1[], char s2[]);

2.  (10)  Write a function called itoa.  It is the converse of atoi.  It
takes in an integer and converts it to a corresponding string.  The function
prototype should be:

void itoa(char dst[], int x);

The result of the conversion should be placed in dst.

3.  (10) Write a program that takes in a series of integer arguments on the
command line and prints out the arguments in sorted order.
> sorter 5 2 4 6 3 2 6 3 34 2333 54
2 2 3 3 4 5 6 6 34 54 2333