Add student example inputs

examples/gcd/gcd.mc

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+/* calulcate modulo */
+int mod(int a, int b){
+  return a-(a/b*b);
+}
+
+/* calulate greatest common divisor */
+int gcd(int x, int y){
+    int c;
+    if (x < 0){
+      x = -x;
+    }
+
+    if (y < 0){
+      y = -y;
+    }
+
+    while (y != 0) {
+      c = mod(x, y);
+      x = y;
+      y = c;
+    }
+    return x;
+}
+
+int main() {
+    int a;
+    int b;
+
+    print("Please enter the first number: ");
+    print_nl();
+    a = read_int();
+    print("Please enter the second number: ");
+    print_nl();
+    b = read_int();
+
+    int res = gcd(a,b);
+
+    print("The greatest common divisor is: ");
+    print_int(res);
+    print_nl();
+
+    return 0;
+}

examples/gcd/gcd.stdin.txt

@@ -0,0 +1,2 @@
+10
+15

examples/gcd/gcd.stdout.txt

@@ -0,0 +1,3 @@
+Please enter the first number: 
+Please enter the second number: 
+The greatest common divisor is: 5