examples: wamr example program

wasm-base/examples/test.c

@@ -0,0 +1,24 @@
+// https://github.com/bytecodealliance/wasm-micro-runtime/blob/main/doc/build_wasm_app.md#user-content-build-wasm-applications-with-wasi-sdk
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv) {
+  char *buf;
+
+  printf("Hello world!\n");
+
+  buf = malloc(1024);
+  if (!buf) {
+    printf("malloc buf failed\n");
+    return -1;
+  }
+
+  printf("buf ptr: %p\n", buf);
+
+  sprintf(buf, "%s", "1234\n");
+  printf("buf: %s", buf);
+
+  free(buf);
+  return 0;
+}