Replaced manuel removal of \n with strtok function

ch_6/task_15/main.c

@@ -89,14 +89,14 @@ person_t *person_new (addtype_t type, person_t *child) {
     printf("Please enter %s's first name: ",query);
     /* Read in the user's input */
     fgets(new->firstname,STRING_MAX,stdin);
-    /* Remove newline from string */
-    new->firstname[strlen(new->firstname)-1] = '\0';
+    /* Remove trailing newline */
+    strtok(new->firstname,"\n");
     /* Ask the user to enter the person's family name */
     printf("Please enter %s's family name: ",query);
     /* Read in the user's input */
     fgets(new->familyname,STRING_MAX,stdin);
-    /* Remove newline from string */
-    new->familyname[strlen(new->familyname)-1] = '\0';
+    /* Remove trailing newline */
+    strtok(new->familyname,"\n");
     /* Initially set its Kekule number to 0 */
     new->kekule = 0;
     /* Initially set its parent pointers to NULL */