Move cleanMultihash into a module.

Author: hackergrrl

src/api/cat.js

@@ -1,8 +1,7 @@
 'use strict'
 
-const bs58 = require('bs58')
-const isIPFS = require('is-ipfs')
 const promisify = require('promisify-es6')
+const cleanMultihash = require('../clean-multihash')
 
 module.exports = (send) => {
   const cat = promisify((multihash, callback) => {
@@ -15,13 +14,3 @@ module.exports = (send) => {
   })
   return cat
 }
-
-function cleanMultihash (multihash) {
-  if (!isIPFS.multihash(multihash)) {
-    throw new Error('not valid multihash')
-  }
-  if (Buffer.isBuffer(multihash)) {
-    return bs58.encode(multihash)
-  }
-  return multihash
-}

src/clean-multihash.js

@@ -0,0 +1,15 @@
+'use strict'
+
+const bs58 = require('bs58')
+const isIPFS = require('is-ipfs')
+
+module.exports = function (multihash) {
+  if (!isIPFS.multihash(multihash)) {
+    throw new Error('not valid multihash')
+  }
+  if (Buffer.isBuffer(multihash)) {
+    return bs58.encode(multihash)
+  }
+  return multihash
+}
+