Tool to convert (translate) C to Go?

What tool to use to convert C source code into Go source code?

For example, if the C code contains:

struct Node {
    struct Node *left, *right;
    void        *data;
};

char charAt(char *s, int i) {
    return s[i];
}

the corresponding Go code generated by the tool should be:

type Node struct {
    left, right *Node
    data        interface{}
}

func charAt(s string, i int) byte {
    return s[i]
}

The tool does not need to be perfect. It is OK if some parts of the generated Go code need to be corrected by hand.