Fixes

src/blocks/affineDecrypt.js

@@ -45,7 +45,7 @@ module.exports =  {
     return text
     .split("")
     .map(require("./util/toNum.js"))
-    .map((num)=>(reverseLookupTable[num]))
+    .map((num)=>(Number.isInteger(num) ? reverseLookupTable[num] : num))
     .map(require("./util/toChar.js"))
     .join("");
   },

src/blocks/affineEncrypt.js

@@ -45,7 +45,7 @@ module.exports =  {
     return text
     .split("")
     .map(require("./util/toNum.js"))
-    .map((num)=>(lookupTable[num]))
+    .map((num)=>(Number.isInteger(num) ? lookupTable[num] : num))
     .map(require("./util/toChar.js"))
     .join("");
   },

src/blocks/substitution.js

@@ -18,7 +18,7 @@ module.exports =  {
   execute: function({text, mapping}, elem){
     mapping = mapping.toLowerCase();
     var letterMapping = {};
-    for(var i = 0; i < (mapping.length - 1); i++){
+    for(var i = 0; i < (mapping.length - 1); i = i + 2){
       letterMapping[mapping[i]] = mapping[i+1];
     }
 
@@ -26,15 +26,10 @@ module.exports =  {
     .split("")
     .map((char)=>{
       if(char.toLowerCase() in letterMapping){
-        if(char.toLowerCase() == char){
+        return letterMapping[char.toLowerCase()]
-          return letterMapping[char];
       }
       else{
-          return letterMapping[char.toLowerCase()].toUpperCase();
+        return char.toLowerCase();
-        }
-      }
-      else{
-        return char;
       }
     })
     .join("");