prog: test: simple function call test

programs/test/test.c

@@ -1,3 +1,5 @@
+#include <mango/log.h>
+#include <stdio.h>
 #include <string.h>
 
 const char *s
@@ -152,6 +154,14 @@ const char *s
 
 int main(void)
 {
-	const char *s = "Hello, world!";
-	return strlen(s);
+	kern_logf("Test 1");
+	kern_logf("Test 2");
+	kern_logf("Test 3");
+
+	const char *text = "Hello, world!";
+	char s2[32];
+	snprintf(s2, sizeof s2, "%s", text);
+	size_t v = strlen(s);
+	kern_logf("%s, %zu", s2, v);
+	return 0;
 }