Exercises from Chapter 1
                  

1.3

                                   Solution

1.3 // Concatenate two strings
    String strcat(String s1, String s2);

    // Return the length of a string
    int length(String s1);
  
    // Extract a substring, beginning at start, of length length
    String extract(String s1, int start, int length);

    // Get first character
    char first(String s1);

    // Compare two strings
    int strcmp(String s1, String s2);

    // Copy a string
    int strcpy(String source, String dest);