Fix links on chapter 18

Author: namcios

18_1_Accessing_Bitcoind_with_Go.md

@@ -160,7 +160,7 @@ However, a quirk with hashes in `rpcclient` is that they will typically print in
 
 ### Run Your Code
 
-You can download the complete code from the [src directory](src/17_1_blockinfo.go).
+You can download the complete code from the [src directory](src/18_1_blockinfo.go).
 
 You can then run:
 ```
@@ -185,7 +185,7 @@ Due to limitations of the `btcd` `rpcclient`, you can't make a use of the ```get
 ```
 ```client.GetBalance("*")``` requires the ```"*"``` input, due to a quirk with `btcd`. The asterisk signifies that you want to get the balance of all of your wallets.
 
-If you run [the src code](src/17_1_getbalance.go), you should get an output similar to this:
+If you run [the src code](src/18_1_getbalance.go), you should get an output similar to this:
 ```
 $ go run getbalance.go 
 0.000689 BTC
@@ -279,7 +279,7 @@ Only afterward do you use the `getreceivedbyaddress` RPC, on your decoded addres
 
 	fmt.Println(wallet)
 ```
-When you run [the code](src/17_1_getamountreceived.go), you should get output similar to:
+When you run [the code](src/18_1_getamountreceived.go), you should get output similar to:
 ```
 $ go run getamountreceived.go 
 0.0085 BTC
@@ -331,7 +331,7 @@ func main() {
 	fmt.Println(sent)
 }
 ```
-When you run [the code](src/17_1_sendtransaction.go), the txid of the transaction is outputted: 
+When you run [the code](src/18_1_sendtransaction.go), the txid of the transaction is outputted: 
 
 ```
 $ go run sendtransaction.go

18_2_Accessing_Bitcoind_with_Java.md

@@ -154,7 +154,7 @@ PubKey: 0368d0fffa651783524f8b934d24d03b32bf8ff2c0808943a556b3d74b2e5c7d65
 
 ### Run Your Code
 
-The code for these examples can be found in [the src directory](src/17_2_App-getinfo.java) and should be installed into the standard directory structure created here as `~/java-project/src/main/java/com/blockchaincommons/lbtc/App.java`. It can then be compiled and run.
+The code for these examples can be found in [the src directory](src/18_2_App-getinfo.java) and should be installed into the standard directory structure created here as `~/java-project/src/main/java/com/blockchaincommons/lbtc/App.java`. It can then be compiled and run.
 
 ```
 $ mvn compile
@@ -278,7 +278,7 @@ System.out.println("Sent signedRawTx (txID): " + sentRawTransactionID);
 
 ### Run Your Code
 
-You can now run [the transaction code](src/17_2_App-sendtx.java) as `~/java-project/src/main/java/com/blockchaincommons/lbtc/App.java`.
+You can now run [the transaction code](src/18_2_App-sendtx.java) as `~/java-project/src/main/java/com/blockchaincommons/lbtc/App.java`.
 
 ```
 $ mvn compile
@@ -317,7 +317,7 @@ To do this, use `JavaBitcoindRpcClient`'s `BitcoinAcceptor` class, which allows
   acceptor.run();
 ```
 
-See [the src directory](src/17_2_App-listen.java) for the complete code. Every time a transaction is sent or a new block is generated, you should see output on your console:
+See [the src directory](src/18_2_App-listen.java) for the complete code. Every time a transaction is sent or a new block is generated, you should see output on your console:
 ```
 Transaction: {account=Tests, address=mhopuJzgmTwhGfpNLCJ9CRknugY691oXp1, category=receive, amount=5.0E-4, label=Tests, vout=1, confirmations=0, trusted=false, txid=361e8fcff243b74ebf396e595a007636654f67c3c7b55fd2860a3d37772155eb, walletconflicts=[], time=1513132887, timereceived=1513132887, bip125-replaceable=unknown}
 

18_3_Accessing_Bitcoind_with_NodeJS.md

@@ -111,7 +111,7 @@ The result of the BCRPC functions is a JSON object containing information about
 
 ### Run Your Code
 
-You can find the `getinfo` code in [the src directory](src/17_3_getinfo.js).
+You can find the `getinfo` code in [the src directory](src/18_3_getinfo.js).
 ```
 $ node getinfo.js
 1831094
@@ -163,7 +163,7 @@ agent.getWalletInfo(function (err, walletInfo) {
 });
 ```
 
-The source is available as [walletinfo.js](src/17_3_walletinfo.js).
+The source is available as [walletinfo.js](src/18_3_walletinfo.js).
 ```
 $ node walletinfo.js
 0.008498
@@ -261,7 +261,7 @@ You should get an output similar to this:
 }
 ```
 
-The full code is available as [sendtx.js](src/17_3_sendtx.js).
+The full code is available as [sendtx.js](src/18_3_sendtx.js).
 
 ## Summary: Accessing Bitcoind with Node
 

18_4_Accessing_Bitcoind_with_Python.md

@@ -125,7 +125,7 @@ print("---------------------------------------------------------------\n")
 
 ### Run Your Code
 
-You can retrieve [the src code](src/17_4_getinfo.py) and run it with `python3`:
+You can retrieve [the src code](src/18_4_getinfo.py) and run it with `python3`:
 ```
 $ python3 getinfo.py
 ---------------------------------------------------------------
@@ -239,7 +239,7 @@ pprint(utxo_tx_details)
 print("---------------------------------------------------------------\n")
 ```
 
-This code is available at [walletinfo.py](src/17_4_walletinfo.py).
+This code is available at [walletinfo.py](src/18_4_walletinfo.py).
 
 ```
 $ python3 walletinfo.py 
@@ -418,7 +418,7 @@ send_tx = rpc_client.sendrawtransaction(signed_tx['hex'])
 ```
 ### Run Your Code
 
-The [sample code](src/17_4_sendtx.py) is full of `print` statements to demonstrate all of the data available at every point:
+The [sample code](src/18_4_sendtx.py) is full of `print` statements to demonstrate all of the data available at every point:
 ```
 $ python3 sendtx.py 
 Creating a Transaction

18_5_Accessing_Bitcoind_with_Rust.md

@@ -135,7 +135,7 @@ Here's the complete code to retrieve a block hash, turn that into a block, and p
 
 ### Run Your Code
 
-You can access the [src code](src/17_5_main-getinfo.rs) and run it. Unfortunately, the "Block" info will come out a bit ugly because this example doesn't include a library to prettify it.
+You can access the [src code](src/18_5_main-getinfo.rs) and run it. Unfortunately, the "Block" info will come out a bit ugly because this example doesn't include a library to prettify it.
 ```
 $ cargo run 
    Compiling btc_test v0.1.0 (/home/standup/btc_test)
@@ -289,7 +289,7 @@ println!("{:?}", txid_sent);
 
 ### Run Your Code
 
-You can now run the complete code from the [src](src/17_5_main-sendtx.rs).
+You can now run the complete code from the [src](src/18_5_main-sendtx.rs).
 
 ```
 $ cargo run

18_6_Accessing_Bitcoind_with_Swift.md

@@ -191,7 +191,7 @@ makeCommand(method: method,param: param) { result in
 
 ### Run Your Code
 
-The complete code is available in the [src directory](src/17_6_getinfo.playground). Load it into your Xcode playground and then "Editor -> Run Playground" and you should get results like:
+The complete code is available in the [src directory](src/18_6_getinfo.playground). Load it into your Xcode playground and then "Editor -> Run Playground" and you should get results like:
 ```
 {
     bestblockhash = 00000000000000069725608ebc5b59e520572a8088cbc57ffa5ba87b7f300ac7;
@@ -385,7 +385,7 @@ Sending your transaction is equally simple:
 }
 ```
 
-The code for this transaction sender can be found in the [src directory](src/17_6_sendtx.playground).
+The code for this transaction sender can be found in the [src directory](src/18_6_sendtx.playground).
 
 ## Use Swift in Other Ways