"Add get length function"

Closes #8 (closed)

stack.c

@@ -17,6 +17,20 @@ void stack_peek(stack s, int *value){
     }
 }
 
+void stack_print(const stack s) {
+	//TODO: replace if statement with following as soon as relevant function is implemented
+	//if (!stack_is_empty()) {
+	if (s.top >= 0) {
+		printf("          TOP\n--------------------\n");
+		for (int* spot = s.data + s.top; spot >= s.data; --spot) {
+			printf("%8d |  %12d\n", spot - s.data, *spot);
+		}
+		printf("--------------------\n          BOTTOM\n");
+	} else {
+		printf("STACK EMPTY\n");
+	}
+}
+
 void stack_clone(stack s, stack *clone) {
     clone->top = s.top;
     clone->capacity = s.capacity;
@@ -30,3 +44,4 @@ int get_length(stack s)
 {
     return s->top + 1;
 }
+